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.frmregister.txtregemail;
	var mobileNo=document.frmregister.txtregmobile;
	var pName=document.frmregister.txtregname;

	if ((pName.value==null)||(pName.value=="")){
		alert("Please provide your Name along with your Email ID or Mobile Number or both to complete registration!");
		pName.focus();
		return false;
	}

	if (((emailID.value==null)||(emailID.value=="")) && ((mobileNo.value==null)||(mobileNo.value==""))){
		alert("Please provide either your Email ID or Mobile Number or both to complete registration!");
		emailID.focus();
		return false;
	}
	if (((emailID.value!=null)&&(emailID.value!="")&&(echeck(emailID.value)==true)) ||((mobileNo.value!=null)&&(mobileNo.value!=""))){

		document.frmregister.submit();
	
	}
 }