var ie4 = (document.all) ? true : false;
var ns4 = (document.layers) ? true : false;
var ns6 = (document.getElementById && !document.all) ? true : false;

function hidelayer(lay) {
if (ie4) {document.all[lay].style.visibility = "hidden";}
if (ns4) {document.layers[lay].visibility = "hide";}
if (ns6) {document.getElementById([lay]).style.visibility = "hidden";}

}
function showlayer(lay) {
if (ie4) {document.all[lay].style.visibility = "visible";}
if (ns4) {document.layers[lay].visibility = "show";}
if (ns6) {document.getElementById([lay]).style.visibility = "visible";}

}

function changeColor(lay,color) {
if (color == ""){color="#e0e0e0"};
if (ie4) {document.all[lay].style.backgroundColor = color;}
if (ns4) {document.layers[lay].backgroundColor = color;}
if (ns6) {document.getElementById([lay]).style.backgroundColor = color;}

}

function resetColor(lay,color) {
if (color == ""){ myColor = "white"; } else { myColor = color; }
if (ie4) {document.all[lay].style.backgroundColor = myColor;}
if (ns4) {document.layers[lay].backgroundColor = myColor;}
if (ns6) {document.getElementById([lay]).style.backgroundColor = myColor;}

}


function writetolayer(lay,txt) {
if (ie4) {
document.all[lay].innerHTML = txt;
}
if (ns4) {
document[lay].document.write(txt);
document[lay].document.close();
}
if (ns6) {
over = document.getElementById([lay]);
range = document.createRange();
range.setStartBefore(over);
domfrag = range.createContextualFragment(txt);
while (over.hasChildNodes()) {
over.removeChild(over.lastChild);
}
over.appendChild(domfrag);
   }
}

function setClass(myID,myClass){
if (ie4) {document.all[myID].className = myClass;}
if (ns4) {document.layers[myID].className = myClass;}
if (ns6) {document.getElementById([myID]).className = myClass;}
}