function getElementsByClass(searchClass,node,tag) {
  	var classElements = new Array();
  	if ( node == null )
  		node = document;
  	if ( tag == null )
  		tag = '*';
  	var els = node.getElementsByTagName(tag);
  	var elsLen = els.length;
  	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
  	for (i = 0, j = 0; i < elsLen; i++) {
  		if ( pattern.test(els[i].className) ) {
  			classElements[j] = els[i];
  			j++;
  		}
  	}
  	return classElements;
  }  

function toggleContent(id) {
    var contentItems = getElementsByClass('content418');
    for (var i=0; i<contentItems.length; i++) {
      if (contentItems[i].className == "content418 contentOn") {
        contentItems[i].className = "content418 contentOff";
      }
    }
    var navItems = document.getElementById("firmNav").getElementsByTagName("a");
    for (var i=0; i<navItems.length; i++) {
      if (navItems[i].className == "selected") {
        navItems[i].className = "";
      }
    }
    document.getElementById('content'+id).className = "content418 contentOn";
    document.getElementById('nav'+id).className = "selected";
  }