function form_validation() {
 	if(document.getElementById('your_name').value=='') {
	  alert('Please enter your name');
	  document.getElementById('your_name').focus();
	  return false;
	}
	if(document.getElementById('your_email').value=='') {
	  alert('Please enter your email address');
	  document.getElementById('your_email').focus();
	  return false;
	}
	else {
		var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   		var address = document.getElementById('your_email').value;
   		if(reg.test(address) == false) {
      		alert('Invalid Email Address');
			document.getElementById('your_email').focus();
     		 return false;
		}
	}	
	
	if(document.getElementById('your_phone').value=='') {
	  alert('Please enter your phone no');
	  document.getElementById('your_phone').focus();
	  return false;
	}
	
	
}