Script web in DHTML

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<script language="JavaScript1.2"> /* Top-Down scrolling window Script- ΠDynamic Drive (www.dynamicdrive.com) For full source code, visit http://www.dynamicdrive.com This notice MUST stay intact for use */ //change 1 to another integer to alter the scroll speed. Greater is faster var speed=1 var currentpos=0,alt=1,curpos1=0,curpos2=-1 function initialize(){ startit() } function iecompattest(){ return (document.compatMode!="BackCompat")? document.documentElement : document.body } function scrollwindow(){ if (document.all) temp=iecompattest().scrollTop else temp=window.pageYOffset if (alt==0) alt=1 else alt=0 if (alt==0) curpos1=temp else curpos2=temp if (curpos1!=curpos2){ if (document.all) currentpos=iecompattest().scrollTop+speed else currentpos=window.pageYOffset+speed window.scroll(0,currentpos) } else{ currentpos=0 window.scroll(0,currentpos) } } function startit(){ setInterval("scrollwindow()",10) } window.onload=initialize </script>