/*
It allows to concatenate functions to be called on OnLoad Event
*/
function addLoadEvent(func) 
{
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

/**
Show/Hide an HTML element
*/
function showHide(id) {
	if (document.getElementById) {
		obj = document.getElementById(id);
		if (obj.style.display == "none") {
			obj.style.display = "";
		} else {
			obj.style.display = "none";
		}
	}
}