function getScrollTop(){
	if(document.documentElement&&document.documentElement.scrollTop){
		return document.documentElement.scrollTop;//FF3(strict),IE7(strict),OP9
	}else if(document.body.scrollTop){
		return document.body.scrollTop;//FF2-3(loose),IE7(loose),IE6(loose),SF3
	}
	return 0;//FF2(strict),IE6(strict)
}
/*visibility*/
function toggleVis(id){
	var div=$get(id);
	div.style.display=(div.style.display=='block'||div.style.display=='')?'none':'';
}
function toggleText(id){
	var div=$get('div'+id);
	var lnk=$get('lnk'+id);
	div.style.overflow=(div.style.overflow=='hidden'||div.style.overflow=='')?'visible':'hidden';
	div.style.height=(div.style.overflow=='hidden'||div.style.overflow=='')?'15px':'auto';
	lnk.innerHTML=(div.style.overflow=='hidden')?'more...':'...less';
}
/*preview*/
function previewShow(divId,e){
	if(document.all)e=event;
	clientX=e.clientX;clientY=e.clientY;
	var div=$get(divId);
	div.style.left=(clientX-5)+'px';
	var scrollTop=getScrollTop();
	div.style.top=(scrollTop+clientY)+'px';
	div.style.display='';
}
function previewHide(divId){
	var div=document.getElementById(divId);
	div.style.display='none';
}