png透明

function fixPng(png) {
   var blank = new Image();
   blank.src = 'images/blank.gif';
   // get src
   var src = png.src;
   // set width and height
   //if (!png.style.width) { png.style.width = $(png).width(); }
   //if (!png.style.height) { png.style.height = $(png).height(); }
   // replace by blank image
   png.src = blank.src;
   // set filter (display original image)
   png.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "',sizingMethod='scale')";

 }