// getAnchorPosition( anchorname )
// This function returns an object having .x and .y properties which are the coordinates
// of the named anchor, relative to the page.
function getAnchorPosition(anchorname)
{
	// This function will return an Object with x and y properties
	var useWindow = false;
	var coordinates = new Object();
	var x = 0;
	var y = 0;

	// Browser capability sniffing
	var use_gebi   = false;
	var use_css    = false;
	var use_layers = false;

	if (document.getElementById) { use_gebi   = true;}
	else if (document.all)       { use_css    = true;}
	else if (document.layers)    { use_layers = true;}

	// Logic to find position
 	if (use_gebi && document.all)
 	{
 		x = AnchorPosition_getPageOffsetLeft(document.all[anchorname]);
		y = AnchorPosition_getPageOffsetTop(document.all[anchorname]);
	}
	else
	{
		if (use_gebi)
		{
			var o = (document.getElementById(anchorname))? document.getElementById(anchorname): document.getElementByName(anchorname); // voor de mensen die denken dat name en id hetzelfde zijn
			x = AnchorPosition_getPageOffsetLeft(o); //o.offsetLeft = bug in FireFox;
			y = o.offsetTop;
		}
 		else
 		{
 			if( use_css )
 			{
				x = AnchorPosition_getPageOffsetLeft(document.all[anchorname]);
				y = AnchorPosition_getPageOffsetTop(document.all[anchorname]);
			}
			else
			{
				if( use_layers )
				{
					var found = 0;
					
					for( var i = 0; i < document.anchors.length; i++ )
					{
						if( document.anchors[i].name == anchorname )
						{
							found = 1;
							break;
						}
					}
					
					if( found == 0 )
					{
						coordinates.x = 0;
						coordinates.y = 0;
						return coordinates;
					}
					
					x = document.anchors[i].x;
					y = document.anchors[i].y;
				}
				else
				{
					coordinates.x = 0;
					coordinates.y = 0;
					return coordinates;
				}
			}
		}
	}

	coordinates.x = x;
	coordinates.y = y;
	return coordinates;
}



// getAnchorWindowPosition( anchorname )
//   This function returns an object having .x and .y properties which are the coordinates
//   of the named anchor, relative to the window
function getAnchorWindowPosition(anchorname) {
	var coordinates = getAnchorPosition(anchorname);
	var x=0;
	var y=0;
	if (document.getElementById) {
		if (isNaN(window.screenX)) {
			x = coordinates.x - document.body.scrollLeft + window.screenLeft;
			y = coordinates.y - document.body.scrollTop + window.screenTop;
			}
		else {
			x = coordinates.x + window.screenX + (window.outerWidth-window.innerWidth) - window.pageXOffset;
			y = coordinates.y + window.screenY + (window.outerHeight-24-window.innerHeight) - window.pageYOffset;
			}
		}
	else if (document.all) {
		x = coordinates.x - document.body.scrollLeft + window.screenLeft;
		y = coordinates.y - document.body.scrollTop + window.screenTop;
		}
	else if (document.layers) {
		x = coordinates.x + window.screenX + (window.outerWidth-window.innerWidth) - window.pageXOffset;
		y = coordinates.y + window.screenY + (window.outerHeight-24-window.innerHeight) - window.pageYOffset;
		}
	coordinates.x = x;
	coordinates.y = y;
	return coordinates;
	}

// Functions for IE to get position of an object
function AnchorPosition_getPageOffsetLeft (el) {
	var ol = el.offsetLeft;
	while ((el = el.offsetParent) != null) { 
		ol += el.offsetLeft; 
		}
	return ol;
	}
function AnchorPosition_getWindowOffsetLeft (el) {
	var scrollamount = document.body.scrollLeft;
	return AnchorPosition_getPageOffsetLeft(el)-scrollamount;
	}	
function AnchorPosition_getPageOffsetTop (el) {
	var ot = el.offsetTop;
	while((el = el.offsetParent) != null) { 
		ot += el.offsetTop; 
		}
	return ot;
	}
function AnchorPosition_getWindowOffsetTop (el) {
	var scrollamount = document.body.scrollTop;
	return AnchorPosition_getPageOffsetTop(el)-scrollamount;
	}