/////////////////////////////// png 이미지처리
function setPng24(obj) {
	obj.width=obj.height=1;
	obj.className=obj.className.replace(/\bpng24\b/i,"");
	obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\""+ obj.src +"\",sizingMethod=\"image\");"
	obj.src ="./images/blank.gif";
	return "";
}