function echeck(str) 
{

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("invalid email")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("invalid email")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("invalid email")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("invalid email")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("invalid email")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("invalid email")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("invalid email")
		    return false
		 }

 		 return true					
}
	
	


var digits = "0123456789";

var phoneNumberDelimiters = "()- ";

var validWorldPhoneChars = phoneNumberDelimiters + "+";

var minDigitsInIPhoneNumber = 10;

function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }

    return true;
	}
	function trim(s)
	{   var i;
    var returnString = "";
   
    for (i = 0; i < s.length; i++)
    {   
        
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
	}
	function stripCharsInBag(s, bag)
	{   var i;
    var returnString = "";
    
    for (i = 0; i < s.length; i++)
    {   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
	}

	function checkInternationalPhone(strPhone){
	var bracket=3
	strPhone=trim(strPhone)
	if(strPhone.indexOf("+")>1) return false
	if(strPhone.indexOf("-")!=-1)bracket=bracket+1
	if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
	var brchr=strPhone.indexOf("(")
	if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
	if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}


function ValidateForm(){
	var emailID=document.frmSample.Email
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("please enter your email")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }