function preload(){
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/top.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/top2.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/top3.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/submit1.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/submit2.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/submit3.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/reset1.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/reset2.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/reset3.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/next1.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/next2.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/next3.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/back1.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/back2.gif";
	new Image().src="http://www.under-dx.com/skin/etc/underbbs/img/back3.gif";
}
function button(buttonimg){
document.getElementById('submit').setAttribute('src',buttonimg);
}
function button2(buttonimg){
document.getElementById('reset').setAttribute('src',buttonimg);
}