function change_block(block_id, button_id)
{
var block=document.getElementById(block_id);
var button=document.getElementById(button_id);
if (block.style.display=='block'){
if (button.className=='block_button_open') button.className='block_button_closed';
block.style.display='none';
}
else{
if (button.className=='block_button_closed') button.className='block_button_open';
block.style.display='block';
}
}
function popup_picture(ID, width, height, alt)
{
var scroll;
scroll="no";
var top=0, left=0;
if(width > screen.width-10 || height > screen.height-28) scroll = "yes";
if(height < screen.height-28) top = Math.floor((screen.height - height)/2-14);
if(width < screen.width-10) left = Math.floor((screen.width - width)/2-5);
width = Math.min(width, screen.width-10);
height = Math.min(height, screen.height-28);
var wnd = window.open("","","scrollbars="+scroll+",resizable=yes,width="+width+",height="+height+",left="+left+",top="+top);
wnd.document.write(
""+
"<"+"script type=\"text/javascript\">"+
"function KeyPress()"+
"{"+
" if(window.event.keyCode == 27) "+
" window.close();"+
"}"+
""+
""+(alt == ""? "''":alt)+""+
""+
"![\""+alt+"\"](\""+ID+"\")
"+
""
);
wnd.document.close();
}