var reEmail = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/

function checkData(formObj) {
	if (formObj.nameField.value.length==0)
		{ 
			alert ("Please fill in your name");
			formObj.nameField.focus();
			formObj.nameField.select();
			return false;
		}
		
		else if (!reEmail.test(formObj.emailField.value))
		{ 
			alert("Invalid email address");
			formObj.emailField.focus();
			formObj.emailField.select();
			return false;
		}
		
	else if(formObj.subjectField.value.length==0)
	 	{ 
			alert ("Please fill in the subject");
			formObj.subjectField.focus();
			formObj.subjectField.select();
			return false;
		}
		
		else if(formObj.messageField.value.length==0)
	 	{ 
			alert ("Please write your message");
			formObj.messageField.focus();
			formObj.messageField.select();
			return false;
		}
		
		else {
		alert ("Thanks. Your email has been sent");
		return true;
				}
}// End of Function