function transNumToImg(iconfolder , num ,len)
{
	var numstr = (typeof(num) == 'string')?num:num.toString();
	var chr ;
	var html='';
	for(var i=0 ; i< len - numstr.length;i++) html+='<img src="'+iconfolder+'/0.gif" border="0"/>';
	for(i=0 ; i < numstr.length;i++)
	{
		chr = numstr.charAt(i);
		html+='<img src="'+iconfolder+'/'+chr+'.gif" border="0" />' ;
	}

	return html;
}

function swapImage(object)
{
	var src = object.src;
	var lowsrc = object.lowsrc;
	object.src = lowsrc;
	object.lowsrc = src;
}

function changeBgImg(obj,bgimageUrl)
{
	obj.style.backgroundImage = bgimageUrl;
}

function preLoadImage()
{
	var argnum = arguments.length;
	for(var i =0 ;i< argnum ;i++)
	{
		var myImage = new Image() 
		myImage.src = arguments[i] ;
	}	
}