function efecto_png( )
{    
    var detectada = navigator.appVersion.split("MSIE")
    var version = parseFloat(detectada[1])
    var pila = new Array( )
	
    if (version >= 5.5 && version < 7.0 && document.body.filters) {
        for (var i = 0, len = document.images.length; i < len; ++i) {
		    var img = document.images[i]
            var nombre = img.src		

			// workaround! error en IE
            if (nombre.substring(nombre.length - 3, nombre.length).toLowerCase( ) == "png") {
				pila.push(img)
			}	
		}
		
        for (var i = 0, len = pila.length; i < len; ++i) {
		    var img = pila.pop( )
		    img.outerHTML = "<span style=\"width:" + img.width + "px; height:" + img.height + "px; filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + img.src + "', sizingMethod='scale');\"></span>"
		}
    }
}	

window.onload = efecto_png