function xmlHTTP() {
	
	var url
	var myDisplay
	var xmlhttp
	
	
	this.loadXML = loadXML;
	this.setURL = setURL;
	this.setDisplay = setDisplay;
	
	function setURL(myVar)  {
		url=myVar
	}
	
	function setDisplay(myVar)  {
		myDisplay=myVar
	}
	
	
	function loadXML()
	{
	
	xmlhttp=null
	// code for Mozilla, etc.
	if (window.XMLHttpRequest)
	  {
	  xmlhttp=new XMLHttpRequest()
	  }
	// code for IE
	else if (window.ActiveXObject)
	  {
	  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP")
	  }
	if (xmlhttp!=null)
	  {
	
	  xmlhttp.onreadystatechange=state_Change
	  xmlhttp.open("GET",url,true)
	  xmlhttp.send(null)
	  }
	else
	  {
	  alert("Your browser does not support XMLHTTP.")
	  }
	}
	
	
	
	function state_Change()
	{
	// if xmlhttp shows "loaded"
	if (xmlhttp.readyState==4)
	  {
	  // if "OK"
	  if (xmlhttp.status==200)
	  {
	  //alert("XML data OK")
	   
	 document.getElementById(myDisplay).innerHTML=xmlhttp.responseText
	//  loadXMLCarrinho('ver_carrinho.php')
	  }
	  else
	  {
	  alert("Problem retrieving XML data:" + xmlhttp.statusText)
	  }
	  }
	}
}

function showMain(nId) {
	var myNL = new xmlHTTP();
	myNL.setURL("ficha.php?id="+nId)
	myNL.setDisplay('maindisplay')
	myNL.loadXML()
}