Comment créer une barre de recherche ?

<script language="JavaScript">
var n = 0;
function findInPage(str) {
var txt, i, found;
if (str == "") return false;
if (document.layers) {
if (!window.find(str)) while(window.find(str, false, true)) n++;
else n++;
if (n == 0)
alert("Not found.");
}
if (document.all) {
txt = window.document.body.createTextRange();
for (i = 0; i <= n & (found = txt.findText(str)) != false; i++) {
txt.moveStart("character", 1);
txt.moveEnd("textedit");
}
if (found) {
txt.moveStart("character", -1);
txt.findText(str);
txt.select();
txt.scrollIntoView();
n++;
}
else {
if (n > 0) {
n = 0;
findInPage(str);
}
else
alert("Not found.");
}
}
return false;
}
</script>
<form name="search" onSubmit="return findInPage(this.string.value);">
<font size=3>
<input name="string" type="text" size=15 onChange="n = 0;">
</font>
<input type="submit" value="Find">
</form>
<p>

    * <SCRIPT language=JavaScript>
    * /* Find In Page Script- By Mike Hall (MHall75819@aol.com) */
    * /* Recherche de mot */
    * var NS4 = (document.layers); // Which browser?
    * var IE4 = (document.all);
    * var win = window; // window to search.
    * var n = 0;
    * function findInPage(str) {
    * var txt, i, found;
    * if (str == "")
    * return false;
    * // Find next occurance of the given string on the page, wrap around to the
    * // start of the page if necessary.
    * if (NS4) {
    * // Look for match starting at the current point. If not found, rewind
    * // back to the first match.
    * if (!win.find(str))
    * while(win.find(str, false, true))
    * n++;
    * else
    * n++;
    * // If not found in either direction, give message.
    * if (n == 0)
    * alert("Je suis navré, je n'ai rien trouvé. Vérifiez l'orthographe.");
    * }
    * if (IE4) {
    * txt = win.document.body.createTextRange();
    * // Find the nth match from the top of the page.
    * for (i = 0; i <= n && (found = txt.findText(str)) != false; i++) {
    * txt.moveStart("character", 1);
    * txt.moveEnd("textedit");
    * }
    * // If found, mark it and scroll it into view.
    * if (found) {
    * txt.moveStart("character", -1);
    * txt.findText(str);
    * txt.select();
    * txt.scrollIntoView();
    * n++;
    * }
    * // Otherwise, start over at the top of the page and find first match.
    *
    * else {
    * if (n > 0) {
    * n = 0;
    * findInPage(str);
    * }
    * // Not found anywhere, give message.
    * else
    * alert("Je suis navré, je n'ai rien trouvé. Vérifiez l'orthographe.");
    * }
    * }
    * return false;
    * }
    * </SCRIPT>
    *
    * <FORM name=search onsubmit="return findInPage(this.string.value);"><INPUT
    * name=string onchange="n = 0;">
    * <INPUT type=submit value=Rechercher></FORM>