/**
* cross-browser event handling for Trident (IE5+), Gecko (NS6+, Moz, FFox) and Presto (Opera7+)
*
* @author Scott Andrew (sligthly edited)
* @todo Testa på WebCore (Safari) och KHTML (Konqueror)
*/
function addEvent(elm, evType, fn, useCapture)
{
    if (elm.addEventListener) {
        // W3C DOM-way
        elm.addEventListener(evType, fn, useCapture);
        return true;
    } else if (elm.attachEvent) {
        // MSIE way (Trident)
        var r = elm.attachEvent('on' + evType, fn);
        return r;
    } else {
        // onEvent-way (Tasman)
       elm['on' + evType] = fn;
    }
}