Q1310 How can I trim leading or trailing whitespace/extra spaces?

<script language="JavaScript"><!--
function trim(strText) { 
    // this will get rid of leading spaces 
    while (strText.substring(0,1) == ' ') 
        strText = strText.substring(1, strText.length);

    // this will get rid of trailing spaces 
    while (strText.substring(strText.length-1,strText.length) == ' ')
        strText = strText.substring(0, strText.length-1);

   return strText;
} 
//--></script>

<script language="JavaScript"><!--
function trim(str) { 
    str.replace(/^\s*/, '').replace(/\s*$/, ''); 

   return str;
} 
//--></script>

function trim(str) {
  var newstr;
  newstr = str.replace(/^\s*/, "").replace(/\s*$/, ""); 
  newstr = newstr.replace(/\s{2,}/, " "); 
  return newstr;
}