function changeImgSrc(idImg) {   
  var img = $(idImg), src = img.src; 
  var imgOn = "_on.gif", imgOff = "_off.gif"; 
  var index = src.indexOf("_on.gif"); 
  if (index >= 0) {
		src = src.substr(0, index) + imgOff;
	}
  else {
    index = src.indexOf("_off.gif");
    src = src.substr(0, index) + imgOn;
  }
	//alert(src);
  img.src = src;
}

function showLoginBox(idToShow){
 if ($(idToShow) != null) {
	 if ($(idToShow).style.display == 'none'){
		 Effect.BlindDown(idToShow, {duration: .3});
	 }else{
		 Effect.BlindUp(idToShow, {duration: .3});					 	
	 }
 }
}