// clear_field (element, colour)
	//
	//	Parameters:		element - String containing the name of text field
	//					colour - String containing the color to color the text field.
	//
	//	Description: 	This function colors the text field, specified in the element
	//					parameter, with the color in the colour parameter.
	//					
	function clear_field (element, colour)
	{
		if (document.all) document.all[element].style.background = colour;
	}

	// validate_field (element, colour)
	//
	//	Parameters:		element - String containing the name of text field
	//					colour - String containing the color to color the text field.
	//
	//	Description: 	This function checks that the text field, specified in the element
	//					parameter contains text. If it does not it colors the text field
	//					with the color in the colour parameter.
	//					
	function validate_field (element, colour)
	{
		if (document.register[element].value == "")
		{ 
			if (document.all) document.all[element].style.background = colour;
			return false;
			
		} 
		else return true;
	}
	
	function validate_email (element)
	{
		var s_email = new String(document.register[element].value);
		if (s_email.IndexOf("@") == -1) return false;
		else return true;
	}
	
	// 	validate_number (element)
	//	Description:
	//
	function validate_number (element, colour)
	{
		if (isNaN(document.register[element].value))
		{
			document.all[element].style.background = colour;
			return false;
		} else return true;
	}