// JavaScript Document

function validation(form) {
      
      
	if(form.first_name.value == '') {
	
	alert('Please enter your first name');
	form.first_name.focus();
	return false;
	}
	
	
	if(form.last_name.value == '') {
	
	alert('Please enter your last name');
	form.last_name.focus();
	return false;
	}
	
	if(form.email.value == '') {
	
	alert('Please enter your email address');
	form.email.focus();
	return false;
	}
	
	if (echeck(form.email.value)==false){
		form.email.value=""
		form.email.focus()
		return false
	}
	
	
	return true;
}

/**
 * DHTML email validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

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 address.")
		   return false
		}

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

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

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

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

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

 		 return true					
	}