function preload()
{
	var btn1normal=new Image();	btn1normal.src='btn1normal.gif';
	var btn1hover=new Image();	btn1hover.src='btn1hover.gif';
	var btn1click=new Image();	btn1click.src='btn1click.gif';
	var btn2normal=new Image();	btn2normal.src='btn2normal.gif';
	var btn2hover=new Image();	btn2hover.src='btn2hover.gif';
	var btn2click=new Image();	btn2click.src='btn2click.gif';
	var btn3normal=new Image();	btn3normal.src='btn3normal.gif';
	var btn3hover=new Image();	btn3hover.src='btn3hover.gif';
	var btn3click=new Image();	btn3click.src='btn3click.gif';
}
function doOver(s)	{document.images['btn'+s].src='btn'+s+'hover.gif';}
function doOut(s)	{document.images['btn'+s].src='btn'+s+'normal.gif';}
function doDown(s)	{document.images['btn'+s].src='btn'+s+'click.gif';}