/**
 * @author David Pardo: Corunet
 * Run after loading
 */

/* Modified by Rosario Rascuna. 2009 */
/* Repackaged as a rails plugin by Orban Botond 2009 */

var xOffset,yOffset;
var tempX = 0;
var tempY = 0;

//detect browser
var IE = document.all?true:false
if (!IE) {
	document.captureEvents(Event.MOUSEMOVE)
}


/*attach a handler to the onmousedown event that calls a function to store the values*/
document.onmousedown = getMouseXY;

function calculate_offsets() {
  // find the reference point 
  var firstElement=document.getElementById('prova');
	//find the offset coordinates
	xOffset = 0;
	yOffset = 0;
	xOffset=findPosX(firstElement);
	yOffset=findPosY(firstElement);
	if (IE){ // In IE there's a default margin in the page body. If margin's not defined, use defaults
		var marginLeftExplorer  = parseInt(firstElement.style.marginLeft);
		var marginTopExplorer   = parseInt(firstElement.style.marginTop);
		/*assume default 10px/15px margin in explorer*/
		if (isNaN(marginLeftExplorer)) {marginLeftExplorer=10;}
		if (isNaN(marginTopExplorer)) {marginTopExplorer=15;}
		xOffset=xOffset+marginLeftExplorer;
		yOffset=yOffset+marginTopExplorer;
	}
	
}

/*Functions*/
/*Find positions*/
function findPosX(obj){
	var curleft = 0;
	if (obj.offsetParent){
		while (obj.offsetParent){
			curleft += obj.offsetLeft
			obj = obj.offsetParent;
		}
	}else if (obj.x){
		curleft += obj.x;
	}
	return curleft;
}

function findPosY(obj){
	var curtop = 0;
	if (obj.offsetParent){
		while (obj.offsetParent){
			curtop += obj.offsetTop
			obj = obj.offsetParent;
		}
	}else if (obj.y){
		curtop += obj.y;
	}
	return curtop;
}

function getMouseXY(e) {
	calculate_offsets()
	if (IE) {
		tempX = event.clientX + document.body.scrollLeft
		tempY = event.clientY + document.body.scrollTop
	} else {
		tempX = e.pageX
		tempY = e.pageY
	}
	tempX-=xOffset;
	tempY-=yOffset;
	if ((tempX >= 0) && (tempY >=0)) {
		var url = '/javascripts/click?x='+tempX+"&y="+tempY+"&url="+document.URL;
		saveclick(url);
	}
	return true;
}

function saveclick(url) {
  var headID = document.getElementsByTagName("head")[0];         
  var newScript = document.createElement('script');
      newScript.type = 'text/javascript';
      newScript.src = url;
  headID.appendChild(newScript);
}