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 E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}


function ValidateForm(){
	var emailID=document.frmSample.txtEmail
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
 }



function checkForm(theForm) {
	theErr = "";
	theF = document.forms[theForm];
		
	for(i=0; i<theF.elements.length; i++)
	{	
		theName = theF.elements[i].name;
		if (theName.indexOf("r_") == 0) { // if name begins with "r_" - designates 'required'
			thenameLC = theName.toLowerCase();
			if (thenameLC.indexOf("email") > -1) { echeck(theF.elements[i].value) } // check email
			if (theF.elements[i].value == "") { theErr += theName.replace(/^(r_)/, '') + "\n"; } // generate list of required fields minus the 'r_' at the beginning of the field name
		}
	}

	if (theErr != "") {
		theErr = "ALERT: The following fields are required:\n\n" + theErr;
		alert(theErr);
	} else { theF.submit(); }

}