// JavaScript Document
function validateForm() {
   

    if (document.forms[0].txt_f.value =="") {
       alert("Your first name please!");
       document.forms[0].txt_f.focus();
       return (false);
    }
    if (document.forms[0].txt_l.value =="") {
       alert("Your last name please!");
       document.forms[0].txt_l.focus();
       return (false);
    }
	
	/*--------------------emai begin-------------------*/
	if (document.forms[0].email.value =="") {
       alert("Your Email Id please!");
       document.forms[0].email.focus();
       return (false);
    }
	
	if (document.forms[0].email.value !="") 
	   {
	    var str=document.forms[0].email.value;
	    var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("E-mail ID should be in proper format!");
		   document.forms[0].email.value='';
		   document.forms[0].email.focus();
		   return false;
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID");
		   document.forms[0].email.value='';
		   document.forms[0].email.focus();
		   return false;
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID");
			document.forms[0].email.value='';
			document.forms[0].email.focus();
		    return false;
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID");
			document.forms[0].email.value='';
			document.forms[0].email.focus();
		    return false;
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID");
			document.forms[0].email.value='';
			document.forms[0].email.focus();
		    return false;
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID");
			document.forms[0].email.value='';
			document.forms[0].email.focus();
		    return false;
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID");
			document.forms[0].email.value='';
			document.forms[0].email.focus();
		    return false;
		 }
	   }
	/*----------------email end-----------------------*/
				
    return true;
    
}