function validate_required(field,alerttxt)
{
	with (field)
	{
		if (value==null||value=="")
		{
			alert(alerttxt);return false;
		}
		else {return true}
	}
}

function validate_email(field,alerttxt)
{
	with (field)
	{
		apos=value.indexOf("@");
		dotpos=value.lastIndexOf(".");
		if (apos<1||dotpos-apos<2) 
		{
			alert(alerttxt);return false;
		}
		else 
		{
			return true;
		}
	}
}
	
function validate_form(thisform)
{
	with (thisform)
	{
		if (validate_required(name,"Name must be filled out correctly!")==false)
		{
			name.focus();return false;
		}
		
		if (validate_email(email,"Email must be filled out correctly!")==false)
		{
			email.focus();return false;
		}
		
		if (validate_required(comment,"Comment must be filled out correctly!")==false)
		{
			comment.focus();return false;
		}
	}
}