//Highlight image script- By Dynamic Drive
//For full source code and more DHTML scripts, visit 
// jako style w obiekcie nalezy ustawic np. style="filter:alpha(opacity=50);-moz-opacity:0.5"
http://www.dynamicdrive.com
//This credit MUST stay intact for use

function makevisible(cur,which){
strength=(which==0)? 1 : which

if (cur.style.MozOpacity)
cur.style.MozOpacity=strength
else if (cur.filters)
cur.filters.alpha.opacity=strength*100
}