method: clean

problem: Sortable doesn't work with FireFox 1.5 / 2.0 and probably other browsers (IE6 and Opera are OK)

Platform: Fedora Core 6

Temporary Fix (works in my case):

add this line:

arg = arg.replace(/ /g, " ");

inside clean method before this one:

div.innerHTML = wrap[1] + arg + wrap[2];

same result (a space inside created tag) but no more problems with FireFox 1.5 / 2.0 and other browsers too.