求助~~谁来帮我挑挑错  我是在是找不到错误  不知道怎么办了
<!---------------------------->  
  <!--                        5_2.html                     -->  
  <!---------------------------->  
  <html>  
  <head>  
  <title>  </title>  
  <script   type= "text/javascript "   src= "5_2.js ">  </script>  
  </head>  
  <body   onload= "init() ">  
  <script   type= "text/javascript "   src= "5_2.js ">  </script>  
  <p>  
  <br> 2   down               4   left         6   right         8   up    </P>  
  <div   id= "blockdiv "   style= "position:absolute;left:50;top:85;width:40; ">  
  <img   src= "3.gif "   width= "40 "   height= "40 "   border= "0 ">  </div>  </body>  
  </html>      
  <!---------------------------->  
  <!--                        5_2.js                     -->  
  <!---------------------------->  
 function   init() 
 { 
 block=blockdiv.style; 
 block.xpos=parseInt(block.left) 
 block.ypos=parseInt(block.top) 
 block.activeleft=false; 
 block.activeright=false; 
 block.activeup=false; 
 block.activedown=false; 
 document.onkeydown=keyDown; 
 document.onkeyup=keyUp; 
 } 
 function   keyDown(e) 
 {{var   ieKey=event.keyCode;var   nKey=0;} 
 if((ieKey==50)   &&   !block.activeleft){ 
          block.activeleft=true; 
          block.activeright=false; 
          slideleft() 
          } 
 if((ieKey==52)   &&   !block.activeright){ 
          block.activeright=true; 
          block.activeleft=false; 
          slideright() 
          } 
 if((ieKey==54)   &&   !block.activeup){ 
          block.activeup=true; 
          block.activedown=false; 
          slideup() 
          } 
 if((ieKey==56)   &&   !block.activedown){ 
          block.activedown=true; 
          block.activeup=false; 
          slidedown() 
          }    
 } 
 function   keyUp(e) 
 {{var   ieKey=event.keyCode;} 
 if(iekey==50)   block.activeleft=false; 
 if(iekey==52)   block.activeright=false; 
 if(iekey==54)   block.activeup=false; 
 if(iekey==56)   block.activedown=false; 
 } 
 function   slideleft() 
 { 
 if(block.activeleft){ 
             block.xpos   -=   5; 
             block.left=block.xpos; 
             status   =    "x: "   +   block.xpos   +    "y: "   +   block.ypos; 
             setTimeout( "slideleft() ",20); 
             } 
 } 
 function   slideright() 
 { 
 if(block.activeright){ 
             block.xpos+=5; 
             block.left=block.xpos; 
             status   =    "x: "   +   block.xpos   + &