Xpath with wildcards

1. I have a list of books arranged in XML format like below (stripped down)
2. User type in any words and the system will match the words to the book title and return the sorted result.

3. I am currently facing problem on using wildcard,
4. I am just using Javascript to loop the XML

On below is my part of my problematic script that doesn't work, I hope somebody can do correction on it


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var myKeyword = "coral" //User enter keywords...

xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async=false;
xmlDoc.load("books.xml");
var root = xmlDoc.documentElement;
var myNodes = root.selectSingleNode("/XML");
var myXpath = "BOOK";


myXpath += "[contains(TITLE, '" + myKeyword  + "')]" //put the keywords into the Xpath... problems....

var myNodes2 = myNodes.selectNodes(myXpath);
for (i=0; i < myNodes2.length; i++)
{
 //loop and display...
 var myStr += myNodes2[i].selectSingleNode("TITLE").text;
}
myDiv.innerHTML = myStr;

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<XML>
<BOOK>
<TITLE>A preliminary report on the diversity and feeding relationship of reef fishes of One Tree Island, Great Barrier Reef system,</TITLE>
</BOOK>
<BOOK>
<TITLE>A preliminary underwater survey of the extent of the coral reefs in and around some of the islands in the Gulf of Mannar,</TITLE>
</BOOK>
</XML>