function okno640(pole) {
var win = window.open(pole,'_blank','menubar=no,width=660,height=505,top=150,left=150');
if (win) return false;
else return true;
}

function okno480(pole) {
var win = window.open(pole,'_blank','menubar=no,width=500,height=665,top=150,left=150');
if (win) return false;
else return true;
}

function okno320(pole) {
var win = window.open(pole,'_blank','menubar=no,width=340,height=265,top=150,left=150');
if (win) return false;
else return true;
}

function okno1000(pole) {
var win = window.open(pole,'_blank','menubar=no,width=1020,height=625,top=0,left=0');
if (win) return false;
else return true;
}

function okno800(pole) {
var win = window.open(pole,'_blank','menubar=no,width=820,height=625,top=150,left=150');
if (win) return false;
else return true;
}