function showImage(img_name,w,h) {
myWin= open("","","width="+w+",height="+h+",status=no,toolbar=no,menubar=no,scrollbars=no,resizable=no");
myWin.document.write("Image view");
myWin.document.write('
');
myWin.document.write("");
myWin.document.close();
}