// JavaScript Document

var xmlhttp;
var Loaded = "<img src='engine/javascript/ajax/load.gif' />";

function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

function createobject() {
	if(window.ActiveXObject) {
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	} else if (window.XMLHttpRequest) {
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}

function do_main(method, url, query, loading) {
	if(method == "post") {
		createobject();
		xmlhttp.open("POST", url, true);
		xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		xmlhttp.onreadystatechange = function() {
			if(xmlhttp.readyState == 4) {
				document.getElementById(loading).innerHTML = xmlhttp.responseText;
				
				document.getElementById("loading").className="loading-invisible";
			} else {
				
				document.getElementById(loading).innerHTML = Loaded;
				document.getElementById("loading").className="loading-visible";
				
				var arrayPageSize = getPageSize();
				document.getElementById("loading").style.height =arrayPageSize[1];

				var object = document.getElementById('loading').style; 
				object.filter ="alpha(opacity=35)";
				
			}
		}
		xmlhttp.send(query);
	}
}