function setPng24(obj) { 
var request_os = window.navigator.userAgent; 
var os_array = request_os.split(";"); 

if(os_array[1] != " MSIE 7.0") { 
obj.width=obj.height=1; 
obj.className=obj.className.replace(/png24/i,''); 
obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+ obj.src +"',sizingMethod='image');"; 
obj.src=''; 
} 

return ''; 
}