function $(element){
		return document.getElementById(element);
	}
	
	var Element = {	
		getDimensions: function(element) {
	    	var _element = $(element);
	    	var display = _element.style.display;
	    	if (display != 'none' && display != null)
	      		return {width: _element.offsetWidth, height: _element.offsetHeight};
	    	var els = _element.style;
	    	var originalVisibility = els.visibility;
	    	var originalPosition = els.position;
	    	var originalDisplay = els.display;
	    	els.visibility = 'hidden';
	    	els.position = 'absolute';
	    	els.display = 'block';
	    	var originalWidth = _element.clientWidth;
	    	var originalHeight = _element.clientHeight;
	    	els.display = originalDisplay;
	    	els.position = originalPosition;
	    	els.visibility = originalVisibility;
	    	return {width: originalWidth, height: originalHeight};
  		}		  
	}	
	//IE6¹ýÂËPNGͼƬ
	function filterimagePng(arrayID){			
		if(!!(window.attachEvent && !window.opera)){			
			for(var i = 0 ;i<arrayID.length;i++){
				var imgId = arrayID[i];
				var imgObj = $(imgId);
				if(imgObj != null){
					var divpng = document.createElement('div');
					var imgDimentsions = Element.getDimensions(imgId);
					var height = imgDimentsions.height;
					var width = imgDimentsions.width;
					divpng.id = imgId;
					divpng.style.cssText = 'width:'+width+';height:'+height+
						';filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src="'+imgObj.src + '", sizingMethod="scale");';
					imgObj.parentNode.replaceChild(divpng, imgObj);
				}	
			}
		}
	}