function ajax(url,resposta,msg){
	
		var parametros	= url.split("?")[1];
		var url 		= url.split("?")[0];
				
		try{
			eval("var "+resposta+" = new XMLHttpRequest();");
		}catch(ee){
	    try{
	        eval(resposta + " = new ActiveXObject(\"Msxml2.XMLHTTP\");");
	    }catch(e){
	        try{
	      	   eval(resposta + " = new ActiveXObject(\"Microsoft.XMLHTTP\");");
	        }catch(E){
	        eval(resposta + " = false");
		document.getElementById(resposta).innerHTML='erro';
	       			 }
	  	  		}
		}
		
		//if (msg != null){
			document.getElementById(resposta).innerHTML=('<center><img src="images/loading.gif" ></center>');
		//}
		
		eval(resposta).onreadystatechange=function(){			
			if (eval(resposta).readyState == 4){
				//if (eval(resposta).status == 200){
					var html = eval(resposta).responseText;
					if (document.getElementById(resposta)!= null){
						document.getElementById(resposta).innerHTML=html;
					}
				//}
			}
		}

		eval(resposta).open("POST", url,true);		
		eval(resposta).setRequestHeader('Content-Type','application/x-www-form-urlencoded;charset=UTF-8;');
		eval(resposta).send(encodeURI(parametros));	
}