function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}
function prepareLocator(){
	var locatorSelect = document.getElementById('locatorSelect');
	locatorSelect.onchange = function () {
		var locatorForm = document.getElementById('locator');
		locatorForm.action = this.value;
		locatorForm.submit();
	}
}
addLoadEvent(prepareLocator);