Write the following script for set the default enter key:
<script language="javascript">
$(document).ready(function () {
$("input").bind("keydown",
function (event) {
var keycode = (event.keyCode ? event.keyCode :
(event.which ? event.which : event.charCode));
if (keycode == 13) {
document.getElementById('SubmitButton').click();
return false;
}
else {
return true;
}
});
});
</script>
<input id="InputSearch1" type="text" onblur="if(this.value=='')this.value=this.defaultValue;"
onfocus="if(this.value==this.defaultValue)this.value='';" value="search"/>
<input type="button" id="SubmitButton" />