如何让伪进度条在页面上显示成gif图像

var tb_pathToImage = "Images/loadingAnimation.gif";
imgLoader = new Image(); //  image对象
    imgLoader.src = tb_pathToImage;
    $("body").append("<div id=&#39;Image_load&#39;><img src=&#39;" + imgLoader.src + "&#39; /></div>"); //page中增加Img
    $(&#39;#Image_load&#39;).show(); //show loader
    $("body").append("<div id=&#39;pageover&#39; class=&#39;pageover_bg&#39; ></div>");  //增加遮罩层

.pageover_bg {	
        background-color:#000;
    	filter:alpha(opacity=75);	
    	-moz-opacity: 0.75;	
    	opacity: 0.75;	
    	}	
 #Image_load{	
     position: fixed;	
     display:none;	
     height:13px;	
     width:208px;	
     z-index:103;	
     top: 50%;	
     left: 50%;	
     margin: -6px 0 0 -104px; /* -height/2 0 0 -width/2 */	
     }

$('#Image_load').remove();           
        $('#pageover').remove();