var myGlobalHandlers = {
onCreate: function(){
Element.show('systemWorking');
},
onComplete: function() {
if(Ajax.activeRequestCount == 0){
Element.hide('systemWorking');
}
}
};
Ajax.Responders.register(myGlobalHandlers);

var doGetShow = function (url, params, showid) {
	var myAjax = new Ajax.Updater(
	{success:showid}, 
	 url,
	 {	method:"post", 
	 	parameters:params, 
	 	evalScripts:true, 
	 	onFailure:function () {
		alert("error");
	}});
};
var doPostShow = function (url, formname, showid) {
	var formObj = eval("window.document." + formname);
	var myAjax = new Ajax.Updater(
	{success:showid}, 
		url, 
		{	method:"post", 
			parameters:Form.serialize(formObj), 
			evalScripts:true, 
			onFailure:function () {
		alert("error");
	}});
};