var req;
var div; 

function DoSearch(div_dest) {
	div=div_dest;
	tipus=document.getElementById('establiment_tipus').value;
	text=document.getElementById('establiment_text').value;
	valors="tipus="+tipus+"&text="+text;

	if(window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	} else if(window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	req.open("POST", "recursos/search_establiments.php",true);
	req.onreadystatechange=callback;
	req.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	req.send(valors);
}

function callback() {
	obj = document.getElementById(div);
	setFade(0);

	if(req.readyState == 4) {
		if(req.status == 200) {
			response = req.responseText;
			obj.innerHTML = response;
			fade(0);
		} else {
			alert("There was a problem retrieving the data:\n" + req.statusText);
		}
	}
}

function fade(amt) {
	if(amt <= 100) {
		setFade(amt);
		amt += 10;
		setTimeout("fade("+amt+")", 5);
	}
}

function setFade(amt) {
	obj = document.getElementById(div);

	amt = (amt == 100)?99.999:amt;
	obj.style.filter = "alpha(opacity:"+amt+")";
	obj.style.KHTMLOpacity = amt/100;
	obj.style.MozOpacity = amt/100;
	obj.style.opacity = amt/100;
}