var Browser = "IE"; 
if (navigator.appName=="Netscape") {
Browser="NS";
}
var doc_ref = "";
if (Browser=="NS") {
doc_ref="document.getElementById";
} else {
doc_ref="document.all";
}
var displayState= "none";
function ShowHideDiv(divName){
if (displayState=="none"){
displayState="block";
} else {
displayState="none";
}
if (Browser == "IE") {
eval(doc_ref + '["' + divName + '"].style.display="' + displayState + '"');
} else {
eval(doc_ref + '("' + divName + '").style.display="' + displayState + '"');
}
}