bg_on_img = new Image();
bg_on_img.src='img/menu_bg_on.gif';

function mouseOn(item) {


	if (item.style.backgroundImage.length < 5)
	{	
		item.style.background="url(img/menu_bg_on.gif)";
	}

}

function mouseOff(item) {

	item.style.background="";


}

function dropDownEnv() {

	document.getElementById("envDropdown").style.visibility="visible";


}

function dropUpEnv() {

	document.getElementById("envDropdown").style.visibility="hidden";


}

function dropDownGCD() {

	document.getElementById("gcdDropdown").style.visibility="visible";


}

function dropUpGCD() {

	document.getElementById("gcdDropdown").style.visibility="hidden";


}

function showDiv(newsItem) {
 theDiv = document.getElementById('item_' + newsItem);
 prevDiv = document.getElementById('preview_' + newsItem);

 
 if (theDiv.style.visibility == 'hidden') {
    theDiv.style.visibility = 'visible'; 
    theDiv.style.position = 'static';
    prevDiv.style.visibility = 'hidden';
    prevDiv.style.position = 'absolute';   
      
 } else {
  
    theDiv.style.visibility = 'hidden'; 
    theDiv.style.position = 'absolute';
    prevDiv.style.position = 'static';
    prevDiv.style.visibility = 'visible';     
   
 }

}