IE 6 Pops a Warning

IE 6 Pops a Warning

 I'm using this script to sequentially highlight some list items. Works fine, even in the three Browserii Horibillii - IE 6,7, and 8. But in 6 it pops a warning: "Press OK to continue loading the content of this page"  I'm not sure I even want to worry about IE6 but various sources still give it a 20% share, at least. Although estimates vary Widely. Are these warnings common with IE6, so the poor benighted souls who still use it won't be more bothered than usual? If they are I'm not going to bother unless there is a simple fix.

   
    
    
  1.  jQuery(function(){
    2. 
    
  2.   var originalBg = jQuery("li").css("background-color");
    3. 
    
  3.   var x = 0;
    4. 
    
  4. jQuery(document).everyTime(2000,function()
    5. 
    
  5. { if(x==0) jQuery("li:nth-child(10)").css("background-color",originalBg);
    6. 
    
  6.     jQuery("li:nth-child(" + ++x + ")").css("background-color","yellow");
    7. 
    
  7.     jQuery("li:nth-child(" + (x-1) + ")").css("background-color",originalBg);
    8. 
    
  8. if(x==10) { x=0; }
    9. 
    
  9. },0);  
    10. 
    
  10.   }
    11. 
    
  11.  );
    12.