I have a script butchered from another function on our site to slideout a table if a link is clicked on and slide it back in if the link is clicked again

This all works fine and dandy in IE but in Firefox the table slides down about 1 pixel and then stops !!

Here is the script we use

Code:
OriginalHeight = new Array(); 
function SlideOut(object,dest,direc) { 
    // get height and remove the 'px' 
   h = document.getElementById(object).style.height; 
    strip=/[px]/gi; h = h.replace(strip,''); h = parseInt(h); 
    // set sizes and see if we are finished 
    if (direc == 1) { h+=20; keepgoing = (dest >= h) ? true : false; } else { h-=20; keepgoing = (dest < h) ? true : false;    } 
    if (keepgoing) { 
         // not done yet, timeout so we can keep going 
         document.getElementById(object).style.height = h + 'px'; 
         setTimeout("SlideOut('" + object + "'," + dest + "," + direc + ");",60); 
    } else { 
        // either hide it or return to original size 
        if (direc == 0) { document.getElementById(object).style.display = 'none'; } else { document.getElementById(object).style.height = OriginalHeight[object]+2+'px'; } 
        } 
} 

function ToggleBox(object) { 
    // set original height if it's not already set 
    if (!OriginalHeight[object]) { 
         if (document.getElementById(object).clientHeight == 0) { 
            // if our element is hidden we need to prepare it.. show it, grab the height, shrink it to 0, and hide it again! 
             document.getElementById(object).style.display = 'block';     
             OriginalHeight[object] = document.getElementById(object).clientHeight;     
             document.getElementById(object).style.height = 0; document.getElementById(object).style.display = 'none'; 
         } 
         OriginalHeight[object] = document.getElementById(object).clientHeight;     
        } 
    // expand or contract 
    if (document.getElementById(object).style.display == 'block') { 
        document.getElementById(object).style.height = OriginalHeight[object]; 
        SlideOut(object,5,0); 
    } else { 
        document.getElementById(object).style.display = 'block'; 
        SlideOut(object,OriginalHeight[object],1);     
    } 
}
any help much appreciated as i'm a php coder not javascript

you can see the effect for yourself on the following url
http://www.motorhomefacts.com/ftopic...15.html#197115
Click on the Show them Below >> link which is beneath nukeadmins avatar and the bottom of that post should slideout down to show some usernames