function na_preload_img()
{var img_list=na_preload_img.arguments;if(document.preloadlist==null)
document.preloadlist=new Array();var top=document.preloadlist.length;for(var i=0;i<img_list.length-1;i++){document.preloadlist[top+i]=new Image;document.preloadlist[top+i].src=img_list[i+1];}}
function na_change_img_src(name,nsdoc,rpath,preload)
{var img=eval((navigator.appName.indexOf('Netscape',0)!=-1)?nsdoc+'.'+name:'document.all.'+name);if(name=='')
return;if(img){img.altsrc=img.src;img.src=rpath;}}
function na_restore_img_src(name,nsdoc)
{var img=eval((navigator.appName.indexOf('Netscape',0)!=-1)?nsdoc+'.'+name:'document.all.'+name);if(name=='')
return;if(img&&img.altsrc){img.src=img.altsrc;img.altsrc=null;}}