function disableCtrlVCombination(e) {
	var forbiddenKeys = new Array("v");
	var key;
	var isCtrl;
	if (window.event) {
		key = window.event.keyCode; /* IE */
		if (window.event.ctrlKey)
			isCtrl = true;
		else
			isCtrl = false;
	} else {
		key = e.which; /* firefox */
		if (e.ctrlKey)
			isCtrl = true;
		else
			isCtrl = false;
	}
	/*if ctrl is pressed check if other key is in forbidenKeys array*/
	if (isCtrl) {
		for (i = 0; i < forbiddenKeys.length; i++) {
			/*case-insensitive comparation*/
			if (forbiddenKeys[i].toLowerCase() == String.fromCharCode(key)
					.toLowerCase()) {
				return false;
			}
		}
	}
	return true;
}