var isInternetExplorer = false;
if (navigator.appName.indexOf("Microsoft") != -1)
{
    isInternetExplorer = true;
} 
if (navigator.appName.indexOf("Netscape") != -1)
{
    isInternetExplorer = true;
} 
function doCallAS(dnum) {
 var crashMovie = isInternetExplorer ? document.all.crashMovie : document.crashMovie;
 crashMovie.callByJs(dnum);
}