function checkIE() {
	var ie55 = (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) == 4 && navigator.appVersion.indexOf("MSIE 5.5") != -1);
	var ie6 = (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) == 4 && navigator.appVersion.indexOf("MSIE 6.0") != -1);
	return (ie55 || ie6)? true:false;
}
function eventObserve(obj,event,func,bool){
	try {obj.addEventListener(event,func,bool);}
	catch(e) {obj.attachEvent("on"+event,func);}
}