function okno(url,nazev,x,y) { xc=(screen.width / 2) - (x/2); yc=(screen.height / 2) - (y/2); var windows=window.open(url,nazev,'width='+x+',height='+y+',top='+yc+',left='+xc+',menubar=0,toolbar=0,margins=0,scrollbars=1'); } function oknoImg(url,nazev,x,y) { xc=(screen.width / 2) - (x/2); yc=(screen.height / 2) - (y/2); imgx=x-20; imgy=y-20; var windows=window.open(url,nazev,'width='+x+',height='+y+',top='+yc+',left='+xc+',menubar=0,toolbar=0,margins=0,scrollbars=0'); windows.document.write(''); windows.document.write(''); windows.document.write('

'); } function ImgOn(id) { var button = document.getElementById(id); button.src = eval(id + "_on.src"); } function ImgOff(id) { var button = document.getElementById(id); button.src = eval(id + "_off.src"); }