图形左右晃动脚本

下面为脚本显示区

脚本说明:
第一步:把如下代码加入<head>区域中
<SCRIPT LANGUAGE="JavaScript">
<!--

step = 0;
obj = new Image();

function anim(xp,xk,smer) //smer = direction
{
 obj.style.left = x;

x += step*smer;
 
 if (x>=(xk+xp)/2) {
    if (smer == 1) step--;
       else step++;
    }
 else {
    if (smer == 1) step++;
       else step--;
    }

if (x >= xk) {
       x = xk;
       smer = -1;
      }

if (x <= xp) {
       x = xp;
       smer = 1;
      }
// if (smer > 2) smer = 3;
  setTimeout('anim('+xp+','+xk+','+smer+')', 50);
}

function moveLR(objID,movingarea_width,c)
{

if (navigator.appName=="Netscape") window_width = window.innerWidth;
     else window_width = document.body.offsetWidth;

obj = document.images[objID];   
  image_width = obj.width;
  
  x1 = obj.style.left;
  x = Number(x1.substring(0,x1.length-2));   // 30px -> 30

if (c == 0) {

if (movingarea_width == 0) {
	   		right_margin = window_width - image_width;
	        anim(x,right_margin,1);
			}			
       	  else {
		    right_margin = x + movingarea_width - image_width; 
			if (movingarea_width < x + image_width) window.alert("No space for moving!");
     	  		else anim(x,right_margin,1);
		}
   }
   else {
       if (movingarea_width == 0) right_margin = window_width - image_width;
		  else {
		     x = Math.round((window_width-movingarea_width)/2);
			 right_margin = Math.round((window_width+movingarea_width)/2)-image_width;
		 }
		anim(x,right_margin,1);
   }     	
}

//-->
</SCRIPT>

第二步:在<body>区域加入如下代码
<img src="image1.gif" width=205 height=56 name="picture" style='position: absolute; top: 10px; left: 30px;' BORDER=0>
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>