////////////////////////////////////////////////////////////////////////////////////	
///////////Determine proper syntax for DOM by determining browser type///////////////
//////////////////////////////////////////////////////////////////////////////////// 	

var isDHTML = 0;
var isLayers = 0;
var isAll = 0;
var isID = 0;

if (document.getElementById) {isID = 1; isDHTML = 1;}
else {
browserVersion = parseInt(navigator.appVersion);
if ((navigator.appName.indexOf('Netscape') != -1) && (browserVersion == 4)) {isLayers = 1; isDHTML = 1;}
else {
if (document.all) {isAll = 1; isDHTML = 1;}
}}

function findDOM(objectID,withStyle) {
var display = "display";
	if (withStyle == 1) {
		if (isID) { return (document.getElementById(objectID).style) ; }
		else { 
			if (isAll) { return (document.all[objectID].style); }
		else {
			if (isLayers) { return (document.layers[display].layers[objectID]); }
		};}
	}
	else {
		if (isID) { return (document.getElementById(objectID)); }
		else { 
			if (isAll) { return (document.all[objectID]); }
		else {
			if (isLayers) { return (document.layers[display].layers[objectID]); }
		};}
	}
}


var objectIDCurr='main';
	
	function changeDisplay(objectID) 
	{
	//alert(objectID + "    " + objectIDCurr);
	var domNew = findDOM(objectID,1);
	var domCurr = findDOM(objectIDCurr,1);
	domCurr.display= "none";
	domNew.display= "block";
	objectIDCurr = objectID;
	}