TBanner in JScript

TBanner in JScript(2)  this.transtime=6000;
 this.bannerid=bannerid;
 this.images=new Array();
 this.urls=new Array();
 this.init=BannerInit;
 this.start=BannerStart;
 this.trans=BannerTrans;
}

function BannerInit(imagepath,images,urls){
 this.imagepath=imagepath;
 this.images=images;
 this.urls=urls;
 var banner_image=this.bannerid+"_image";
 var banner_link=this.bannerid+"_link";
 document.write("<a id='"+banner_link+"' target=_blank><IMG id='"+banner_image+"' border=0 style='FILTER:revealTrans(Duration=3.0,Transition=1);VISIBILITY: hidden'></a>")
 PreloadImages(images);
 this.image=eval(banner_image);
 this.link=eval(banner_link);
 BannerTrans(this);//start first trans
}

function BannerTrans(banner){
 Transbanner(banner.image,banner.imagepath+banner.images[banner.index]);
 
 if (banner.index<banner.urls.length)
  banner.link.href=banner.urls[banner.index];
 else{ 
  banner.link.href='#';
  banner.link.target='_self';
  banner.link.disabled=true;
 }
  
 banner.index++;
 if (banner.index >= banner.images.length)
  banner.index=0;
}

function BannerStart(transtime){ 
 this.transtime=transtime;
 setInterval("BannerTrans("+this.bannerid+")",this.transtime)
}