<form id='search-form' name="searchForm" method='get' value action="/search.php">
<input id='search-text' name="query" type='text' onKeyDown="return enterPressed(event);" />
<button id='search-button' type='submit' onclick="return formIsNotEmpty()"></button>
</form>function formIsNotEmpty() {
if (document.getElementById('search-form').elements.item(0).value == "") {
return false;
}
return true;
}
function enterPressed(event) {
var charCode = (event.which) ? event.which : event.keyCode
if (charCode == "13" && formIsNotEmpty())
document.searchForm.submit();
}