function IsEmpty( text ){    if( text.value.length == 0 )         return( true );    for( var i=0; i<text.value.length; ++i )      {        var ch = text.value.charAt(i);        if( ch != ' ' && ch != '\t' )             return( false );    }    return( true );}function IsEmail( text ){    if( text.value.length == 0 )         return( false );    if( text.value.indexOf("@") == -1 || text.value.indexOf(".") == -1 )        return( false );    return( true );}function ValidateContactForm(F){    if ( IsEmpty(F.Name) )        {        alert("Please enter your name.");        F.Name.focus();        }    else 	if ( IsEmpty(F.Email) || !IsEmail(F.Email) )        {        alert("Please enter a valid e-mail address.");        F.Email.focus();        }    else     if ( IsEmpty(F.Comments) )        {        alert("Please leave a comment.");        F.Comments.focus();        }    else	if ( IsEmpty(F.txtKey) )        {        alert("Please type the correct word in this field.");        F.txtKey.focus();        }    else     return( true );        return( false );}