function position(evt, id){ // position publication description
		if(!evt) evt = window.event;    
		if(parseInt(navigator.appVersion) >=4){
		    if(navigator.appName == 'Netscape'){
		        mouse_x = evt.layerX;
				    mouse_y = evt.layerY;
		    }else{
				    mouse_x = event.x;// + (document.documentElement.scrollLeft + document.body.scrollLeft);
				    mouse_y = event.y;// + (document.documentElement.scrollTop + document.body.scrollTop);
		    }
		}
		document.getElementById(id).style.left = mouse_x + 15 + "px";
		document.getElementById(id).style.top = mouse_y + 15 + "px";
		if(document.getElementById(id).style.visibility != "block")
      document.getElementById(id).style.display="block";
	}
	function hide(id){
	  document.getElementById(id).style.display="none";
  }