/*
 View documentation, examples, and source code at:   http://www.JavascriptToolbox.com/
*/
var Position = (function() {
	// Resolve a string identifier to an object
	// ========================================
	function resolveObject(s) {
		if (document.getElementById && document.getElementById(s)!=null) {
			return document.getElementById(s);
		}
		else if (document.all && document.all[s]!=null) {
			return document.all[s];
		}
		else if (document.anchors && document.anchors.length && document.anchors.length>0 && document.anchors[0].x) {
			for (var i=0; i<document.anchors.length; i++) {
				if (document.anchors[i].name==s) { 
					return document.anchors[i]
				}
			}
		}
	}
	
	var pos = {};
	pos.$VERSION = 1.0;
	
	// Установка позиции объекта
	// =============================
	pos.set = function(o,left,top) {
		if (typeof(o)=="string") {
			o = resolveObject(o);
		}
		if (o==null || !o.style) {
			return false;
		}
		
		// If the second parameter is an object, it is assumed to be the result of getPosition()
		if (typeof(left)=="object") {
			var pos = left;
			left = pos.left;
			top = pos.top;
		}
		
		o.style.left = left + "px";
		o.style.top = top + "px";
		return true;
	};
	
	// Возвращает позиции (X,Y) и размеры (width, height) объекта
	// ===========================================
	pos.get = function(o) {
		var fixBrowserQuirks = true;
			// If a string is passed in instead of an object ref, resolve it
		if (typeof(o)=="string") {
			o = resolveObject(o);
		}
		
		if (o==null) {
			return null;
		}
		
		var left = 0;
		var top = 0;
		var width = 0;
		var height = 0;
		var parentNode = null;
		var offsetParent = null;
	
		
		offsetParent = o.offsetParent;
		var originalObject = o;
		var el = o;
		while (el.parentNode!=null) {
			el = el.parentNode;
			if (el.offsetParent==null) {
			}
			else {
				var considerScroll = true;
				if (fixBrowserQuirks && window.opera) {
					if (el==originalObject.parentNode || el.nodeName=="TR") {
						considerScroll = false;
					}
				}
				if (considerScroll) {
					if (el.scrollTop && el.scrollTop>0) {
						top -= el.scrollTop;
					}
					if (el.scrollLeft && el.scrollLeft>0) {
						left -= el.scrollLeft;
					}
				}
			}

			if (el == offsetParent) {
				left += o.offsetLeft;
				if (el.clientLeft && el.nodeName!="TABLE") { 
					left += el.clientLeft;
				}
				top += o.offsetTop;
				if (el.clientTop && el.nodeName!="TABLE") {
					top += el.clientTop;
				}
				o = el;
				if (o.offsetParent==null) {
					if (o.offsetLeft) {
						left += o.offsetLeft;
					}
					if (o.offsetTop) {
						top += o.offsetTop;
					}
				}
				offsetParent = o.offsetParent;
			}
		}
		
	
		if (originalObject.offsetWidth) {
			width = originalObject.offsetWidth;
		}
		if (originalObject.offsetHeight) {
			height = originalObject.offsetHeight;
		}
		
		return {'left':left, 'top':top, 'width':width, 'height':height
				};
	};
	
	// Получить позицию (координаты) центра объекта
	// =================================================
	pos.getCenter = function(o) {
		var c = this.get(o);
		if (c==null) { return null; }
		c.left = c.left + (c.width/2);
		c.top = c.top + (c.height/2);
		return c;
	};
	
	return pos;
})();