/*
Otevre nove okno s predanym url
*/
function newwin(url,win_width,win_height)
{
	win_width+=20;
	win_height+= 60;

	pos_left=Math.round((screen.width-win_width)/2);
	pos_top=Math.round((screen.height-win_height)/2);

	win = window.open(url, "designer_info", "fullscreen=no,width="+win_width+",height="+win_height+",left="+pos_left+",top="+pos_top+",resizable=yes,scrollbars=yes");

    return (typeof(win)=='object')?true:false;
}