var nOpa=0,oObj,nSpeed,nHow=0,xPt,lOn=false;
function ChanSli(wObj,mNum,sNum,nTotl,cClname) {
	clearTimeout(xPt);
	ID='ct'+mNum+'_'+sNum;
	oParent=wObj.parentNode;
	for (i=0;i<nTotl;i++) {
		oParent.getElementsByTagName(wObj.tagName)[i].className='';
		document.getElementById('ct'+mNum+'_'+i).style.display='none';
	}
	wObj.className=cClname;
	oObj=document.getElementById(ID);
	oObj.style.display='';
	nHow=sNum;
	nOpa=0;
	Fade();
}
function Fade() {
	nOpa=nOpa+10;
	if (document.all) {
		oObj.style.filter='alpha(opacity='+nOpa+')';
	}
	else {
		oObj.style.opacity=nOpa/100;
	}
	if (nOpa<100) {
		setTimeout('Fade()',100);
	}
	else if (!lOn) {
		xPt=setTimeout('slplay()',nSpeed);
	}
}
function slplay() {
	var oPobj=document.getElementById('preview').getElementsByTagName('li');
	var nLeElm=oPobj.length;
	if (nHow>=nLeElm-1) {
		nHow=-1;
	}
	nHow++;
	var oSobj=oPobj[nHow];
	ChanSli(oSobj,0,nHow,nLeElm,'on');
}