var agt = navigator.userAgent.toLowerCase();
var is_ie = (agt.indexOf("msie")!= -1 && document.all && agt.indexOf("opera") == -1);
var is_ie5 = is_ie && (agt.indexOf("msie 5") != -1);
var is_ie6 = is_ie && (agt.indexOf("msie 6") != -1);
var is_ie7 = is_ie && (agt.indexOf("msie 7") != -1);
var is_safari = (agt.indexOf("safari") != -1);

var className = (is_ie ? 'className' : 'class');


var pageModified = false;
function confirmExit(url){
	if(pageModified){
		if(!confirm(common_exit_question)){
			return false;
		}else{
			window.location = url;
		}
	}else{
		window.location = url;
	}
}