function checkEmail(emailCntrl)
{
	ok=true
	if(emailCntrl.value=="")
	{
		alert("Please enter e-mail address.")
		emailCntrl.focus()
		ok=false
	}
	else
	{
		mail=emailCntrl.value
		at_pos=mail.indexOf("@")
		dot_pos=mail.indexOf(".")
		if(at_pos<1 || dot_pos<1)
		{
			alert("Please enter valid email address.")
			emailCntrl.focus()
			ok=false
		}
		else
		{
			mail=emailCntrl.value
			condition="yes"
			var at_count=0
			var dot_count=0
			var temp=0
			for(var i=0;i<mail.length;i++)
			{
				if((mail.charCodeAt(i)>0 && mail.charCodeAt(i)<48)||(mail.charCodeAt(i)>57 && mail.charCodeAt(i)<65)||(mail.charCodeAt(i)>91 && mail.charCodeAt(i)<97)||mail.charCodeAt(i)>122)
				{
					if(mail.charAt(i)=="@"||mail.charAt(i)==".")
					{
							if(mail.charAt(i)=="@"){at_count++}else{dot_count++} // counts the no. of times @ and . appears in email
							if(dot_count>=1)
							{
								dot_pos=i
								if((dot_pos>at_pos) && temp==0)
								{
									pos=dot_pos-at_pos
									temp++
								}								
							}
					}
					else
					{
						condition="no"
						i=mail.length
					}
				}
			}
			if(condition=="no")
			{
				alert("Your email contains a blank space or special character.")
				emailCntrl.focus()
				ok=false
			}
			else
			{
				if(at_count>1)
				{
					alert("E-mail contains extra @ ")
					emailCntrl.focus()
					ok=false
				}
				else
				{
					if(pos<2)
					{
						alert("Missing domain name between '@' and '.'")
						emailCntrl.focus()
						ok=false
						i=mail.length
					}
					else
					{	
						count=dot_pos+1
						domain=""
						for(count;count<mail.length;count++)
						{
							domain=domain+mail.charAt(count)		
						}
						dom=new Array("au","com","net","org","edu","in","mil","gov","arpa","biz","aero","name","coop","info","pro","museum","AU","COM","NET","ORG","EDU","IN","MIL","GOV","ARPA","BIZ","AERO","NAME","COOP","INFO","PRO","MUSEUM")
						error="yes"
						for(var k=0;k<dom.length;k++)
						{
							if(domain==dom[k])
							{
								k=dom.length
								error="no"
							}
						}
						if((error=="yes" && (domain.length>2)) || (domain.length<2))
						{
							alert("Domain name must end with well known domains \n or 2-lettered country name. eg com,edu,in etc.")
							emailCntrl.focus()
							ok=false
						}								
					}
				}
			}
		}
	}
	return ok
}

function LTrim(String)
{
	var i = 0;
	var j = String.length - 1;

	if (String == null)
		return (false);

	for (i = 0; i < String.length; i++)
	{
		if (String.substr(i, 1) != ' ' &&
		    String.substr(i, 1) != '\t')
			break;
	}

	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}

function RTrim(String)
{
	var i = 0;
	var j = String.length - 1;

	if (String == null)
		return (false);

	for(j = String.length - 1; j >= 0; j--)
	{
		if (String.substr(j, 1) != ' ' &&
			String.substr(j, 1) != '\t')
		break;
	}

	if (i <= j)
		return (String.substr(i, (j+1)-i));
	else
		return ('');
}

function Trim(String)
{
	if (String == null)
		return (false);

	return RTrim(LTrim(String));
}

function isName(value)
{
	for(i=0;i<value.length;i++)
	{			
		ch = value.charAt(i);
		if ( ((ch <= "z") && (ch >= "a")) || ((ch <= "Z") && (ch >= "A")) || (ch == ' ') || (ch == " ") ) {}
		else 
 			return false;
	}
 	return true;
}
function isPrice(obj)
{
	obj.value = obj.value.replace('$','');
	obj.value = Trim(obj.value);
	
	if(!isFloat(obj.value))
	{
		obj.value = '';
		return false;
	}
	else
		return true;
}

function isDigit(value)
{
	var digit = Boolean(true);
	for(var i=0;i<value.length;i++)
	{
		var ch = value.charAt(i);
		if(!(ch == "0" || ch=="1" || ch=="2" || ch=="3" || ch=="4" || ch=="5" || ch=="6" || ch=="7" || ch=="8" || ch=="9"))
			return false;
	}
	return true;
}
function isFloat(field)
{
	var point = 0;
	var i = 0;
	var beforePoint = 0;
	var afterPoint = 0;
	field = field.toString().replace(',', '');
	for (var a = 0; a < field.length; a++)
	{
    	if(!(field.charAt(a)=="." || field.charAt(a)=="0" || field.charAt(a)=="1" || field.charAt(a)=="2" || field.charAt(a)=="3" || field.charAt(a)=="4" || field.charAt(a)=="5" || field.charAt(a)=="6" || field.charAt(a)=="7" || field.charAt(a)=="8" || field.charAt(a)=="9"))
			return false;
		if(field.charAt(a)==".")
			point++;
	}
	if(point > 1)
		return false;
	if(point == 1)
	{
		while(field.charAt(i)!=".")
		{
			i++;
			beforePoint++;
		}
		afterPoint=field.length-(beforePoint+1);
		if(afterPoint==0 && beforePoint==0)
			return false;
	}
	return true;
}
function isFloatWithNegative(field)
{
	var neg=0;
	var negFlag=0;
	var point=0;
	var i=0;
	var k=1;
	var beforePoint=0;
	var afterPoint=0;
	for(var a=0;a<field.length;a++)
	{
    	if(!(field.charAt(a)=="-" || field.charAt(a)=="." || field.charAt(a)=="0" || field.charAt(a)=="1" || field.charAt(a)=="2" || field.charAt(a)=="3" || field.charAt(a)=="4" || field.charAt(a)=="5" || field.charAt(a)=="6" || field.charAt(a)=="7" || field.charAt(a)=="8" || field.charAt(a)=="9"))
			return false;
		if(field.charAt(a)==".") {
			point++;
		}
		if(field.charAt(a)=="-") {
			neg++;
		}
	}
	if(point > 1) {
		return false;
	}
	if(neg > 1) {
		return false;
	}
	if (neg == 1) {
		while(k < field.length)
		{
			if (field.charAt(k) == '-') {
				negFlag = 1;
				break;
			}
			k++;
		}
		if (negFlag == 1) {
			return false;
		}
	}
	if(point == 1)
	{
		while(field.charAt(i)!=".")
		{
			i++;
			beforePoint++;
		}
		afterPoint=field.length-(beforePoint+1);
		if(beforePoint > 3)
			return false;
		if(afterPoint > 4)
			return false;
		if(afterPoint==0 && beforePoint==0)
			return false;
	}
	return true;
}
function validateControl(cntrl, cntrlName, cntrlType)
{
	if(cntrl)
	{
		cntrlValue = Trim(cntrl.value);
		switch(cntrlType)
		{
			case "text":
				if (cntrlValue.length < 1)
				{
					alert(cntrlName + " is required.");
					cntrl.focus();
					return false;
				}
				break;
			case "dd":
				if (cntrlValue <= 0)
				{
					alert(cntrlName + " is required.");
					cntrl.focus();
					return false;
				}
				break;
			case 'list':
				if(cntrl.selectedIndex == -1)
					var listId = -1;
				else
					var listId = parseInt(cntrl.options[cntrl.selectedIndex].value);
				if (listId == -1)
				{
					alert("Please Select "+cntrlName+".");
					return false;
				}
				break;
		}
	}
	return true;
}