function CheckForm(form)
{
	var i;
	var arr;
	var str;
	var x;
	
	for (i=0;i<form.elements.length;i++)
	{
		if(form.elements[i].name.substr(0,4) == "CHK_")
		{			
			
			str = GetFieldValueByName(form,form.elements[i].name.substr(4));
			
			if(str != null)
			{
			
				str = Trim(str);
							
				arr = form.elements[i].value.split("|");			
				
				switch(arr[0])
				{
					case "STR":
						//check mandatory field							
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field " + arr[4] + " must be completed");
							return false;
						}
						
						//check min length	
						if (str.length < parseInt(arr[1]))
						{
							alert("The " + arr[4] + " field requires a minimum of " + parseInt(arr[1]) + " characters");
							return false;
						}
						
						//check max length
						if (str.length > parseInt(arr[2]))
						{
							alert("The " + arr[4] + " field requires a maximum of " + parseInt(arr[2]) + " characters");
							return false;
						}
						break;
					case "EML":
							
						  var supported = 0;
						  var msgText="";
						  if (window.RegExp) {
							    var tempStr = "a";
							    var tempReg = new RegExp(tempStr);
							    if (tempReg.test(tempStr)) supported = 1;
							  }
						  if (!supported) 
							    return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
								  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
								  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
								  
								  var ret =  (!r1.test(str) && r2.test(str));
									
								  if ((ret == false) && (str.length > 0)) {
									  msgText = Trim("The E-mail address field is incorrect - please check the format and retype");
  									  }
							     
						//incorrect email addrees enetered
						 if ((msgText.length > 0))
						 {
								 alert (msgText);
								 
								 return false;
							}
						//mandatory email address not entered.
						 if ((str.length == 0) && (arr[3] == "True"))
						 {
								 alert ("Please enter a email address");
								 
								 return false;
							}
							
							break;
					
					case "INT":
																
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The " + arr[4] + " field must be completed");
							return false;
						}
						
						//check sanity
						if(!(IsNumeric(str)))
						{
							alert("Use numeric characters only in the " + arr[4] + " field - please retype");
							return false;
						}
												
						//check min value
						if (arr[1] != "x")
						{
							if (str.length < parseInt(arr[1]))
							{
								
								alert("The " + arr[4] + " field requires a minimum of " + parseInt(arr[1]) + " characters");
								return false;
							}
						}
						//check max length
						if (arr[2] != "x")
						{
							if (str.length > parseInt(arr[2]))
							{
								alert("The >" + arr[4] + " field requires a maximum of " + parseInt(arr[2]) + " characters");
								return false;
 					     }
						}
						
						break;
						
				case "SEL":
																

						
						//check sanity should be text
						if((IsNumeric(str)))
						{
							alert("You have not selected a " + arr[4]);
							return false;
						}
												
										
						break;
					
					case "FLOAT":
																		
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field >" + arr[4] + "< must be filled in");
							return false;
						}
						
						//check sanity
						if(!(IsNumeric(str)))
						{
							alert("The value in field >" + arr[4] + "< is numeric only");
							return false;
						}
												
						//check min value
						if (arr[1] != "x")
						{
							if (parseFloat(str) < parseFloat(arr[1]))
							{
								alert("The value in field >" + arr[4] + "< is too small");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (parseFloat(str) > parseFloat(arr[2]))
							{
								alert("The value in field >" + arr[4] + "< is too big");
								return false;
							}
						}
						
						break;
										
						
					case "DATE":
						
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field >" + arr[4] + "< must be filled in");
							return false;
						}
						
						//check sanity
						if(!(IsDate(str)))
						{
							alert("The value in field >" + arr[4] + "< is not a valid date (DD/MM/YYYY)");
							return false;
						}
						
						//check min value
						if (arr[1] != "x")
						{
							if (GetDate(str) < GetDate(arr[1]))
							{
								alert("The date in field >" + arr[4] + "< is less than the minimum date");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (GetDate(str) > GetDate(arr[2]))
							{
								alert("The value in field >" + arr[4] + "< is later than the maximum date");
								return false;
							}
						}
						
						break;
				}
			}
		}
	}
	
	return true;

}

//============================================================================================

function Replace(string,replacechar,replacewith) 
{
	var temp = "";
	var i;
	
	string = '' + string;
	splitstring = string.split(replacechar);
	for(i = 0; i < splitstring.length; i++)
	{
		if(i < (splitstring.length -1))
			temp += splitstring[i] + replacewith;
		else
			temp += splitstring[i];
	}
	return temp;
}

//============================================================================================

function GetFieldValueByName(form,name)
{
	var i;
	
	for (i=0;i<form.elements.length;i++)
	{
		if(form.elements[i].name == name)
			return (form.elements[i].value);
	}
	return null;
}

/*

======================= STANDARD HELPER FUNCTIONS BELOW =======================================

*/
function IsNumeric(str)
{
	var i;
	for(i=0;i<str.length;i++)
	{
		if(!(	((str.charAt(i) <= '9') && (str.charAt(i) >= '0')) ||
				(str.charAt(i) == ' ') || (str.charAt(i) == '.') || (str.charAt(i) == '-')))
			return(false);
	}
	return(true);
}

//============================================================================================


function IsAlphaNumeric(alphane)
{
	var numaric = alphane;
	for(var j=0; j<numaric.length; j++)
		{
		  var alphaa = numaric.charAt(j);
		  var hh = alphaa.charCodeAt(0);
		  if((hh > 47 && hh<58) || (hh > 64 && hh<91) || (hh > 96 && hh<123))
		  {
		  }
		else	{                         
			 return false;
		  }
 		}
 return true;
}


//function IsAlphaNumeric(str)
//{
//	var i;
//	for(i=0;i<str.length;i++)
//	{
//		if(!(	((str.charAt(i) <= '9') && (str.charAt(i) >= '0')) ||
//				((str.charAt(i) <= 'z') && (str.charAt(i) >= 'a')) ||
//				(str.charAt(i) == ' ') || (str.charAt(i) == '-') ||
//				(str.charAt(i) == 'ü') || (str.charAt(i) == 'ä') ||
//				(str.charAt(i) == 'ö') || (str.charAt(i) == 'Ü') ||
//				(str.charAt(i) == 'Ä') || (str.charAt(i) == 'Ö') ||
//				(str.charAt(i) == 'é') || (str.charAt(i) == 'ß') ||
//				((str.charAt(i) <= 'Z') && (str.charAt(i) >= 'A')) ))
//			return(false);
//	}
//	return(true);
//}

//============================================================================================

function IsAlpha(alphane)
{
	var numaric = alphane;
	for(var j=0; j<numaric.length; j++)
		{
		  var alphaa = numaric.charAt(j);
		  var hh = alphaa.charCodeAt(0);
		  if((hh > 64 && hh<91) || (hh > 96 && hh<123))
		  {
		  }
		else	{                         
			 return false;
		  }
 		}
 return true;
}

//function IsAlpha(str)
//{
//	var i;
//	
//	for(i=0;i<str.length;i++)
//	{
//		if(!(	((str.charAt(i) <= 'z') && (str.charAt(i) >= 'a')) ||
//				(str.charAt(i) == ' ') || (str.charAt(i) == '-') ||
//				(str.charAt(i) == 'ü') || (str.charAt(i) == 'ä') ||
//				(str.charAt(i) == 'ö') || (str.charAt(i) == 'Ü') ||
//				(str.charAt(i) == 'Ä') || (str.charAt(i) == 'Ö') ||
//				(str.charAt(i) == 'é') || (str.charAt(i) == 'ß') ||
//				((str.charAt(i) <= 'Z') && (str.charAt(i) >= 'A')) ))
//			return(false);
//	}
//	return(true);
//}


//============================================================================================

function Trim(str)
{
	//trim leding spaces
	while(true)
	{
		if(str.charAt(0) == ' ')
			str = str.substr(1);
		else
			break;
	}
	
	//trim trailing spaces
	while(true)
	{
		if(str.charAt(str.length-1) == ' ')
			str = str.substr(0,str.length-1);
		else
			break;
	}
	return(str);	
}

//============================================================================================

function IsDate(argDate)
{
	var date_split;
	var i;
	var tdate, tmonth, tyear;
	
	date_split = argDate.split('/');
	
	//check for date parts
	if(date_split.length != 3)
		return(false);
		
	//check for zero values
	for(i=0;i<date_split.length;i++)
	{
		if(parseInt(date_split[i]) == 0)
			return(false);
	}
	
	//check for 4-digit year
	if(date_split[2].length != 4)
		return(false);
		
	//check for valid date, e.g. 29/02/1997
	tdate = parseInt(date_split[0]);
	tmonth = parseInt(date_split[1]);
	tyear = parseInt(date_split[2]);
	
	var date = new Date(parseInt(date_split[2]),parseInt(date_split[1])-1,parseInt(date_split[0]));
	
	if(date.getDate() != tdate)
		return(false);
	
	if(date.getMonth() != (tmonth-1))
		return(false);
	
	if(date.getFullYear() != tyear)
		return(false);
		
	return(true);
}


function GetDate(argDate)
{
	//use IsDate() first !!!!
	
	var date_split;	
	var tdate, tmonth, tyear;
	
	date_split = argDate.split('/');
	
		
	
	tdate = parseInt(date_split[0]);
	tmonth = parseInt(date_split[1]);
	tyear = parseInt(date_split[2]);
	
	return date = new Date(parseInt(date_split[2]),parseInt(date_split[1])-1,parseInt(date_split[0]));
		
}