if (document.addEventListener) document.addEventListener('keypress', EcsIptal, true);
else if (document.attachEvent) document.attachEvent('onkeydown', EcsIptal);
else document.onkeydown = EcsIptal;
function EcsIptal(event) {
    if (!event) event = window.event;
    if (!event) return;
    var keyCode = event.keyCode ? event.keyCode : event.charCode;
    if (keyCode == 27) {
        if (event.preventDefault) event.preventDefault();
        if (document.all && window.event && !event.preventDefault) {
            event.cancelBubble = true;
            event.returnValue = false;
            event.keyCode = 0;
        }
        PencereGizle();
        return false;
    }
}
function PencereGizle() {
    PencereKapat('Pencere1');
}