sorry I didn't show U what the function call should do, meanwhile I've solved the problem!
The function looked like this:
function tegn_soejle($score)
{ $m_faktor = 25;
$procent = ($score/13)100;
$procent = round($procent, 2);
$score = $score$m_faktor;
echo "<img src='images\billed.gif' height=7 width=$score border=0> ($procent %)";
}
//----------
I simply changed the "echo" line with a "return" line and that made all the difference...