HtmlEditorExtender and textbox multiline has conflict with my javascript functions

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VB

ASP.NET

Javascript

$(document).ready(function () {
$("input").keydown(function () {
$("input").css("background-color", "yellow");
});
$("input").keyup(function () {
$("input").css("background-color", "pink");
});
});

this script is working for all my textboxes .. and then i add this

<asp:TextBox ID="txtMultiLine" runat="server" Height="250px" Width="100%" Style="background-color: #FFF; display: inline;" TextMode="MultiLine" AutoCompleteType="Enabled" >

Textbox "txtMultiLine" is not being affected by the script.

then i add another script.
function tagKeyWord() {
alert("yes");
}

and this is running for all the textbox that i added an onkeypress="tagKeyWord()" including Textbox "txtMultiLine" ..

and then i added ..
<asp:HtmlEditorExtender ID="txtHTMLContentArea_HtmlEditorExtender" runat="server" Enabled="True" TargetControlID="txtHTMLContentArea">

and then Textbox "txtMultiLine" onkeypress event doesn't trigger .

What will i do??
HtmlEditorExtender and the textbox being multiline is important. So I must find a way that my script function keypress running on a multiline Textbox with HtmlEditorExtender.

Any form of help is highly appreciated.
Regards.