// ************************************************************************************ //
//																				  		//
// <input type="hidden" 														  		//
// 						name="CHK_[fieldname]									  		//
// 						value="[type of check]|min len|max len|required|Friendly Name">	//
//																						//
//						[type of check] = STR,EMAIL,INT,FLOAT,DATE						//																				  		//
//																						//
// You can also use these functions if you need to do smoething mannually:				//
//																						//
//	isValidEmailAddress(sEmail)															//
//	IsNumeric(str)																		//
//  IsDate(argDate)																		//
//																						//
// EXAMPLE:																		  		//
// onsubmit="return CheckForm(document.myform);"								  		//
//																				  		//
// <input type="text" name="fname">												  		//
// <input type="hidden" name="CHK_fname" value="STR|2|50|True|First Name">    	  		//
// 																				  		//
// ************************************************************************************ //

function CheckForm(form)
{

	var i;
	var arr;
	var str;
	var strname;
	var x;
	var errorMsg=""
		
	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));
			strname=form.elements[i].name.substr(4);
			if(str != null)
			{
				str = Trim(str);
				arr = form.elements[i].value.split("|");

				switch(arr[0])
				{
					case "EMAIL":

						//check mandatory field
						if ((str.length == 0) && (arr[1] == "True"))
						{
							errorMsg=errorMsg+"\n"+"> " + arr[2] + " must be filled in";
							document.f1[strname].style.backgroundColor='#ffff99';
							break;
						}

						//check sanity
						if(!(isValidEmailAddress(str)) && (arr[1 ]== "True"))
						{
							errorMsg=errorMsg+"\n"+"> " + arr[2] + " must contain a valid email address";
							document.f1[strname].style.backgroundColor='#ffff99';
							break;
						}
						break;


					case "STR":
						//check mandatory field							
						if ((str.length == 0) && (arr[3] == "True"))
						{
							errorMsg=errorMsg+"\n"+"> " + arr[4] + " must be filled in";
							document.f1[strname].style.backgroundColor='#ffff99';
							break;
						}
						
						//check min length	
						if (str.length < parseInt(arr[1]))
						{
							alert("The value in field > " + arr[4] + " is too short.  It must be at least " +  parseInt(arr[1]) + " characters.");
							document.f1[strname].style.backgroundColor='#ffff99';
							break;
						}
						
						//check max length
						if (parseInt(arr[2])>0){
							if (str.length > parseInt(arr[2]))
							{
								alert("> " + arr[4] + " is too long. It cannot exceed " +  parseInt(arr[2]) + " characters. Current length is " + str.length + " characters.");
								document.f1[strname].style.backgroundColor='#ffff99';
								break;
							}
						}
						break;
					
					case "ALPHASTR":				
						
						
						//check mandatory field							
						if ((str.length == 0) && (arr[3] == "True"))
						{
							errorMsg=errorMsg+"\n"+"> " + arr[4] + " must be filled in";
							document.f1[strname].style.backgroundColor='#ffff99';
							break;
						}
						
						if (!str.match(/^[a-zA-Z0-9]+$/)){
							errorMsg=errorMsg+"\n"+"> " + arr[4] + " must be alphanumeric only.";
							document.f1[strname].style.backgroundColor='#ffff99';
							break;
						}
						break;	

					case "CONFIRM":
						//grab fieldname to compare against
						var sConfirmAgainstName = arr[1];
						
						// compare this field with that field
						if (str != GetFieldValueByName(form,sConfirmAgainstName))
						{
							errorMsg=errorMsg+"\n"+"> " + arr[2] +" do not match";
							document.f1[strname].style.backgroundColor='#ffff99';
							document.f1['pw'].style.backgroundColor='#ffff99';
							break;
						}
						break;	
											
					
					
				}
			}
		}
	}
	
	
	
	if(errorMsg!=""){
		alert("There were errors on the form:\n"+errorMsg);
		return false;
	} else {
		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 isValidEmailAddress(s) {
	var temp = s.replace(/\s/g, "")
	return (temp.match(/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/)) && 
			temp.charAt(0) != "." && !(temp.match(/\.\./))
}

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 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. 02/29/1997
	tdate = parseInt(date_split[1]);
	tmonth = parseInt(date_split[0]);
	tyear = parseInt(date_split[2]);
	
	var date = new Date(parseInt(date_split[2]),parseInt(date_split[0])-1,parseInt(date_split[1]));
	
	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[1]);
	tmonth = parseInt(date_split[0]);
	tyear = parseInt(date_split[2]);
	
	return date = new Date(parseInt(date_split[2]),parseInt(date_split[0])-1,parseInt(date_split[1]));
		
}