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;
MozVer = ( isMozilla ) ? parseFloat( uAgent.substring( uAgent.indexOf( "rv:" ) + 3, uAgent.indexOf( "rv:" ) + 7 ) ) : 0;

function addEvent( sType, fHandler ){
	var shortTypeName = sType.replace(/on/, "");
	if ( window.attachEvent ) {
		window.attachEvent( sType, fHandler );
	} else {
		window.addEventListener(shortTypeName, fHandler, false);	
	}
}

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) {
			oImg = changeImages.arguments[i];
			picSrc = changeImages.arguments[i + 1];
			if ( obj = getObj(oImg) ) obj.src = picSrc;
			else document[oImg].src = picSrc;
		}
	}
}

var preloadFlag = false;