if (document.images)
{
	button01_1=new Image;
	button01_1.src="images/forum_a.gif";
	button01_2=new Image;
	button01_2.src="images/forum_b.gif";
}
function In(imgName){
	if (document.images) {
		document[imgName].src=eval(imgName + "2.src");
	}
}
function Ut(imgName){
	if (document.images) {
		document[imgName].src=eval(imgName + "1.src");
	}
}