var isNav, isNav6, isIE, var_visible, var_hidden, coll, styleObj

if (parseInt(navigator.appVersion) >= 4) {

	if (document.all) {
	IE5 = ((document.all)&&(navigator.appVersion.indexOf("MSIE 5.0")!=-1)) ? true : false;
		//alert("Internet Explorer Detected");
		isIE = true 
		var_visible = "visible";
		var_hidden = "hidden";
		coll = "all."
		styleObj = ".style"
	}
	else if (document.layers) {
		//alert("Netscape Navigator Detected");
		isNav = true
		var_visible = "show";
		var_hidden = "hide";
		coll = "";
		styleObj = ""; 
	}
	else if (document.getElementById) {
		//alert("Netscape 6 Detected");
		isNav6 = true
		var_visible = "visible";
		var_hidden = "hidden";
		coll = "";
		styleObj = ""; 
	}
}

function hide(elementid){
 if(isNav6){
	obj = document.getElementById(elementid).style;
	obj.visibilty = 'hidden';
	return true;
 }
 else{
	eval("document."+coll+elementid+styleObj+".visibility='"+var_hidden+"'");
 }	

}

function show(elementid){
 if(isNav6){
	obj = document.getElementById(elementid).style;
	obj.visibilty = 'visible';
	return true;
 }
 else{
	eval("document."+coll+elementid+styleObj+".visibility='"+var_visible+"'");
 }	
}

function getStyleObject(objectId) {
    if(document.getElementById && document.getElementById(objectId) && !document.all) {
	return document.getElementById(objectId).style;
	} else if (document.all && document.all(objectId)) {
	return document.all(objectId).style;
	} else if (document.layers && document.layers[objectId]) {
    return document.layers[objectId];
	} else {
	return false;
	}
} 

function changeObjectVisibility(objectId, newVisibility) {
    var styleObject = getStyleObject(objectId);
    if(styleObject) {
	styleObject.visibility = newVisibility;
	return true;
    } else {
	return false;
    }
}