var preloadedImgs = new Array();

var Vers=parseInt(navigator.appVersion);
var Netscape4=(document.layers) ? true : false;
var IExplorer4=((document.all)&&(Vers>=4))?true:false;
var Netscape6=(!IExplorer4 && document.getElementById) ? true : false;

function PreloadImgs(src, src_a){
	if (document.images && !Netscape6){
		for (i=2; i<PreloadImgs.arguments.length; i++){
			name = PreloadImgs.arguments[i];
			preloadedImgs[name] = new Image();
			preloadedImgs[name].src = src;
			preloadedImgs[name+'a'] = new Image();
			preloadedImgs[name+'a'].src = src_a;
		}
	}
}

function Deactivate(imgName){
	if (document.images && !Netscape6){
		if (preloadedImgs[imgName]){
			document[imgName].src = preloadedImgs[imgName].src;
		}
	}
}

function Activate(imgName){
	if (document.images && !Netscape6){
		if (preloadedImgs[imgName+'a']){	
			document[imgName].src = preloadedImgs[imgName+'a'].src;
		}
	}
}