var type = false;
if (navigator.userAgent.indexOf("Opera")!=-1 && document.getElementById) type="OP";
if (document.all) type="IE";
if (document.layers) type="NN";
if (!document.all && document.getElementById) type="MO";
if (type==false) type = "MO";

function swapClass(myid,myclass) {
    if (type=="IE") eval("document.all." + myid + ".className='" + myclass + "'");
    if (type=="NN") eval("document." + myid + ".className='" + myclass + "'");
    if (type=="MO" || type=="OP") eval("document.getElementById('" + myid + "').className='" + myclass + "'");
}