//
// function used to verify that a field is non-null
//
// Usage: if ( !trim( form.field.value ) ) alert( 'error' );
//
// $Id: trim.js,v 1.1 2002/03/05 21:46:10 mycroft Exp $
//
function trim( str ) {
    var count = str.length;
    var len = count;
    var st = 0;

    while ( (st < len) && (str.charAt( st ) == ' ') ) {
        st++;
    }
    while ( (st < len) && (str.charAt(len - 1) == ' ') ) {
        len--;
    }

    var tmp = (st > 0 || len < count) ? str.substring(st, len) : str;
    return (tmp);
}