Alleman

I am trying to put links in tooltips, which shouldnt be problem because tooltips can display HTML code, but i just can't get '<' to work. I replaced '>' with & gt; and it works fine, but when i replace '<' with & lt; it says "Invalid XML data". I didn't put space between & and gt;, i do it only here on forum because i dont want it to transtlate it to <. I really don't know what to do anymore, I am using PHP to generate xml data. Please help, thanks in advance