function previewOn(img) { preview2(img,'b');}

function preview2(img,code) {
	var viewImg=new Array;
	if( !viewImg[img.name] ) { viewImg[img.name]=img.src; }
	var re=/(.+)(\.\w+)$/;
	re.exec( viewImg[img.name] );
	var head=RegExp.$1;
	var tail=RegExp.$2;
	var preview=document.getElementById('preview');
	var previewatc=document.getElementById('preview-atc');	
	var previewimg=document.getElementById('preview-img');
	var path = head + "-" + code + tail;
	previewimg.src = path;
	if (typeof document.body.style.maxHeight == "undefined"){
		preview.style.left=document.documentElement.scrollLeft+event.clientX-100+'px';
		preview.style.top=document.documentElement.scrollTop+event.clientY-265+'px';
		preview.style.display="block";
	}else{
		preview.style.bottom="-5px";
	}
}

function closepreview() {
	var preview=document.getElementById('preview');
	if (typeof document.body.style.maxHeight == "undefined"){
		preview.style.display="none";
	}else{
		preview.style.bottom="-325px";
	}
}