function getElementsByStyleClass (className) {
    var all = document.all ? document.all :
    document.getElementsByTagName('*');
    var elements = new Array();
    for (var e = 0; e < all.length; e++)
	if (all[e].className == className)
	    elements[elements.length] = all[e];
    return elements;
}

function SwitchVisible( targetClass ) {
    var rows = getElementsByStyleClass(targetClass);
    var i;
    for (i=0;i<rows.length;i++) {
	if (rows[i].style.visibility=="visible")
	    rows[i].style.visibility="hidden";
	else
	    rows[i].style.visibility="visible";
    }
}