uAgent =  navigator.userAgent.toLowerCase()
isIE = (window.showHelp) ? true : false;
isOpera = (window.opera || uAgent.indexOf('opera') > - 1) ? true : false;
isMac = (uAgent.indexOf( "mac" ) > -1) ? true : false;
isSafari = (uAgent.indexOf("safari") > - 1) ? true : false;
isMozilla = (uAgent.indexOf( "gecko" ) > -1 && !isSafari && !isOpera) ? true : false;

var scrWidth = screen.availWidth;
var scrHeight = screen.availHeight;

function getObj(strObj) {
	return (typeof(strObj) == "object") ? strObj : document.getElementById(strObj);
}

function newImage(arg){
	if (document.images){
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages(){
	if (document.images && (preloadFlag == true)){
		for (var i = 0; i < changeImages.arguments.length; i += 2) {
			;
			picSrc = changeImages.arguments[i + 1];
			if ( obj = getObj( changeImages.arguments[i] ) ) obj.src = picSrc;
			else document[changeImages.arguments[i]].src = picSrc;
		}
	}
}

var preloadFlag = false;