// JavaScript Document

function validate_form()
{
	var err = '';

	//getElementById('etc') gets the object on the page where id="etc"
	//selectedIndex == 0 means nothing yet selected 
	
	//Name Field
	if (document.getElementById('name').value == "")
	{
		err += 'Please enter your name\n'
	}
	
	//Telephone Field
	if (document.getElementById('tel').value == "")
	{
		err += 'Please enter your telephone number\n'
	}
	
	//Email Field
	if (document.getElementById('email').value == "")
		
	{
		err += 'Please enter your email address\n'
	}

	//Comments Field
	if (document.getElementById('comments').value == "")
		
	{
		err += 'Please enter a message\n'
	}

	if (err == '')
	{
		// passed the test
		return true;
	}
	
	else
	{
		// not passed, popup the errors
		alert("There are some problems with this form\n\n"+err)
		return false;
	}
}