function png(){
   if(document.getElementById){	
		if(document.getElementById('sub-btm1').runtimeStyle) {
			document.getElementById('sub-btm1').style.backgroundImage = 'none';
			document.getElementById('sub-btm1').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/sub-btm.png',sizingMethod='noscale')";
		}
		if(document.getElementById('sub-btm2').runtimeStyle) {
			document.getElementById('sub-btm2').style.backgroundImage = 'none';
			document.getElementById('sub-btm2').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/sub-btm.png',sizingMethod='noscale')";
		}
		if(document.getElementById('sub-btm3').runtimeStyle) {
			document.getElementById('sub-btm3').style.backgroundImage = 'none';
			document.getElementById('sub-btm3').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/sub-btm.png',sizingMethod='noscale')";
		}
		if(document.getElementById('sub-top1').runtimeStyle) {
			document.getElementById('sub-top1').style.backgroundImage = 'none';
			document.getElementById('sub-top1').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/sub-top.png',sizingMethod='noscale')";
		}
		if(document.getElementById('sub-top2').runtimeStyle) {
			document.getElementById('sub-top2').style.backgroundImage = 'none';
			document.getElementById('sub-top2').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/sub-top.png',sizingMethod='noscale')";
		}
		if(document.getElementById('sub-top3').runtimeStyle) {
			document.getElementById('sub-top3').style.backgroundImage = 'none';
			document.getElementById('sub-top3').style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/sub-top.png',sizingMethod='noscale')";
		}
   }
}