function geraxmlhttp()
		  {try {/*firefox, opera 8+, safari, IE7*/ xmlhttp = new XMLHttpRequest();}
		   catch(erro1){try {xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");}
						catch(erro2){try {/*IE7-*/ xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");}
									 catch(errofinal) {xmlhttp = false; alert('Este site não funcionará corretamente neste navegador, pois o mesmo não habilita Ajax');}
									 }
						}
			return(xmlhttp);			
		   };	
		   
function ajax(url,iddoelemento)
		  {objxmlhttp = geraxmlhttp();
		   objxmlhttp.onreadystatechange=function() {if (objxmlhttp.readyState==4)
														 document.getElementById(iddoelemento).innerHTML=objxmlhttp.responseText;
													 }
		   objxmlhttp.open("GET",url,true);
		   objxmlhttp.send(null);										 
		   }