function validate() { 

	var name = document.getElementById('Name').value;
	var city = document.getElementById('City').value;
	var phone = document.getElementById('Phone').value;
	var email = document.getElementById('Email').value;
	
	if(name=='') {
		alert('Please fill your name');
		return false;
	}
	else if(city=='') {
		alert('Please fill your city');
		return false;
	}
	else if(phone=='') {
		alert('Please fill your phone number');
		return false;
	}
	else if(email=='') {
		alert('Please fill your email');
			
		return false;
	}
	else if(email) {
		
			if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email)){
				return true;
			}
			else {
				alert("Invalid E-mail Address! Please re-enter.")
				return false;	
			}			
		
	}
			
	else {
		return true;	
	}
	

}