function mehr(paraNum,arrowNum) {
if (document.getElementById(paraNum).style.display=="none") {
    document.getElementById(paraNum).style.display="";
    document.getElementById(arrowNum).src="/usability/collapse.gif";
} else {
    document.getElementById(paraNum).style.display="none";
    document.getElementById(arrowNum).src="/usability/expand.gif";
}
}