var  startposition=150
 var  loop=true
 var  speed=200
 var  step=4
 var  isNS=(navigator.appName=="Netscape")
function makeobj(son,father){
father=(!father)?'':'document.'+father+'.'
if(isNS){
this.css=eval(nest+'document.'+son)
this.scrollheight=this.css.document.height
}
else {
this.css=eval('document.all.'+son+'.style')
this.scrollheight=eval('document.all.'+son+'.offsetHeight')
}
this.up=goup
}
function goup(){
if (parseInt(this.css.top)>-this.scrollheight) {
 this.css.top=parseInt(this.css.top)-step
}
else if(loop) {
 this.css.top=startposition
 }
}
function slideinit() {
 wzslide= new makeobj('layers2','layers1')
 wzslide.css.top=150
 setInterval("wzslide.up()",speed)
}