isIE = (document.all ? true : false);
isDOM = (document.getElementById ? true : false);

function getDivStyle(divname) {
     var style;
     if (isDOM) { style = document.getElementById(divname).style; }
     else { style = isIE ? document.all(divname).style
                     : document.layers[divname]; } // NS4
     return style;
}

function hideElement(divname) {
	 getDivStyle(divname).visibility = "hidden";
	 getDivStyle(divname).display="none";
}

function showElement(divname) {
	 getDivStyle(divname).visibility = "visible";
	 getDivStyle(divname).display="block";
}