var saveWidth = 0;

function scaleImg(what){
what = document.getElementById(what);
if (navigator.appName=="Netscape")
winW = window.innerWidth;
if (navigator.appName.indexOf("Microsoft")!=-1)
winW = document.body.offsetWidth;
if (what.width>(520) || saveWidth>(520)) {
if (what.width==(520))
what.width=saveWidth;

else
{
saveWidth = what.width;
what.style.cursor = "pointer";
what.width=(520);
}

}
}