function preventrefresh () {
	if (!e) var e = window.event;
	var keycode = e.keyCode;
	if (e.which) keycode = e.which;
	var src = e.srcElement;
	if (e.target) src = e.target;
	if (keycode == 116 || keycode == 114) {
		if (e.preventDefault) {
			e.preventDefault();
			e.stopPropagation();
		} else if (e.keyCode) {
			e.keyCode = 0;
			e.returnValue = false;
			e.cancelBubble = true;
		}
		return false;
	}
	var isCtrl = false;
	if (window.event && window.event.ctrlKey) { isCtrl = true; } // IE
	if (!window.event && e.ctrlKey) { isCtrl = true; } // firefox
	if (isCtrl) {
		if (String.fromCharCode(keycode).toLowerCase() == "r") { return false; }
	}
}

//document.onkeydown = preventrefresh;
//document.onkeypress = preventrefresh;
//document.onkeyup = preventrefresh;