function validate(value, id)
{
	errors = 0;
	if(value == '')
	{
		document.getElementById(id+'_err').className = 'show';
		errors = 1;
	}
	else
	{
		document.getElementById(id+'_err').className = 'hidden';
	}
}

function submitForm()
{
	// else, show the none valid fields
	for(i = 0; i < required.length; i++)
	{
		validate(document.getElementById(required[i]).value, required[i]);
	}
	if(errors == 0)
	{
		// if no errors, submit
		document.form1.submit();
	}
}

// sets focus on the first field of the form
function setFocus(id)
{
  document.getElementById(id).focus();
	for(i = 0; i < required.length; i++)
	{
		document.getElementById(required[i]+'_err').className = 'hidden';
	}
}