/* JQuery real position plugin
	 * Methods:
	 * 		$.visibleLeft(): returns the distance between the left window edge and current element
	 * 		$.visibleTop(): returns the distance between the top window edge and current element
	 */
$.userTop=function (o) {
	if (!o||!o.offsetParent) {
		return 0;
	} else {
		var top=o.offsetTop;
		do {
			o=o.offsetParent;
			top+=o.offsetTop;
		} while (o.offsetParent);
	}
	return top;
}
$.userLeft=function(o) {
	if (!o||!o.offsetParent) {
		return 0;
	} else {
		var left=o.offsetLeft;
		do {
			o=o.offsetParent;
//			top+=o.offsetLeft;
			left+=o.offsetLeft;
		} while (o.offsetParent);
	}
	return left;
}
$.fn.visibleTop = function() {
	//multiple elements not anticipated, returns minimum
	var current=-1;
   	this.each(function(){
		//if current isnt defined, then assign it user left
		//or if left is less than left so far
    	current=(current==-1||$.userTop(this)<current)?$.userTop(this):current;
  });
  	return current;
}
$.fn.visibleLeft = function() {
	/*Visible left does not work correctly
	 * there is a mistake top ? left ?
	 *
	 */
	//multiple elements not anticipated, returns minimum
	var current=-1;
   	this.each(function(){
		//if current isnt defined, then assign it user left
		//or if left is less than left so far
    	current=(current==-1||$.userLeft(this)<current)?$.userLeft(this):current;
  });
  	return current;
};