function disableCtrlKeyCombination(e) {
        var forbiddenKeys = new Array('a', 'n', 'c', 'x', 'v', 'j');
        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(isCtrl) {
		for(i=0; i<forbiddenKeys.length; i++) {
        	if(forbiddenKeys[i].toLowerCase() == String.fromCharCode(key).toLowerCase()) {
		return false;
                        }}}
        return true;
}