function expandcollapse (postid) { 

   whichpost = document.getElementById(postid); 
   
   if (whichpost.className=="postshown") { 
      whichpost.className="posthidden"; 
   } 
   else { 
      whichpost.className="postshown"; 
   } 
} 
// ShowHide layers
last_tab='tab1';

function show(layerName) { 
document.getElementById(layerName).style.display = '';
} 

function hide(layerName) { 
document.getElementById(layerName).style.display = 'none';
} 

function showtab(tab_name) {

document.getElementById(last_tab).className = 'tab';

var curr = document.getElementById(tab_name);
curr.className='tab_hover';
hide(last_tab+'_data');
show(tab_name+'_data');
last_tab=tab_name;
}

function changeImage(thumbSRC, gallerySRC) {
     if (document.images) {
	   var thumb = new Image();
     thumb.src = thumbSRC;

     var gallery = new Image();
     gallery.src = gallerySRC;

         document.img.src = gallerySRC;
     }
}