// JavaScript Document

function valid_contact()
{
	var doc=document.contactform;
	if(doc.name.value=="" || doc.name.value==null)
	{
		alert("Please enter name");
		doc.name.focus();
		return false;
	}
	if(doc.phone.value!="")
	{
		if(isNaN(doc.phone.value)==true)
		{
			alert("please enter valid phone number");
			doc.phone.focus();
			return false;
		}
	}
	if(doc.gender.value=="" || doc.gender.value==null)
	{
		alert("Please select gender");
		doc.gender.focus();
		return false;
	}
	if(doc.email.value=="" || doc.email.value==null)
	{
		alert("Please enter email");
		doc.email.focus();
		return false;
	}
	if(echeck(doc.email.value)==false)
	{
		doc.email.value="";
		doc.email.focus();
		return false;
	}
	return true;
}
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					
	}