function getQueryVariable(variable) {
  var query = window.location.search.substring(1);
  var vars = query.split("&");
  for (var i=0;i<vars.length;i++) {
    var pair = vars[i].split("=");
    if (pair[0] == variable) {
      return pair[1];
    }
  } 
  return null;
}

function showMe( id ){
	// define content and tab show/hide classes
	tabShow = "selected";
	tabHide = "";
	contentShow = "portfolioDiv portfolioDivActive";
	contentHide = "portfolioDiv";
	
	// hide active content and tab
	document.getElementById( "content_" + storedTopicId ).className = contentHide;
	document.getElementById( "tab_" + storedTopicId ).className = tabHide;
	
	// show active content and tab
	document.getElementById( "content_" + id ).className = contentShow;
	document.getElementById( "tab_" + id ).className = tabShow;
	
	// set variables for retrieval
	document.getElementById( "curTopic" ).value = id;
	storedTopicId = id;
}