PHP: Calendar class on the same page , suitable for reservation

<?PHP
class BZ_calendar {
var $me , $beg , $end ;
function BZ_calendar ( $num , $beg , $end )
{
$this->me = $num ;
$this->beg = $beg ;
$this->end = $end ;
}
function jj ( $goto , $c1 , $c2 )
{
global $beg , $end ;
$lastday = array(0,31,28,31,30,31,30,31,31,30,31,30,31);
if ( $this->me == 1 ) { $t = $c1 ; }
else { $t = $c2 ; }
$today = getdate( $t );
$tbuff = mktime(0,0,0,$today['mon'],1,$today["year"] ) ;
$tDate = getdate( $tbuff );
$firstwday= $tDate["wday"];
$ld = $lastday[$tDate['mon']];
$td = $today["mday"];
if ( ( $tDate["year"] % 4 ) == 0 ) $ld++ ;
    $nn=0;
    $n=1;
    $aujourduis = date("Y-m-d", time() );
    echo "<tr>";
    while ( $n < $ld )
        {    
    if ( ( ++$nn >= $firstwday ) )
        {
        $value = date("Y-m-d", $tbuff);
        if ( ( $value> $beg && $value< $end ) ||
        (($this->me ==1 ) && ( $value== $end ) ) ||
        (($this->me ==2 ) && ( $value== $beg ) ))
        {
        echo "<td  bgcolor=#cc6600 > " ;
        }
        elseif ( ( ($value == $beg) && ($this->me ==1 ) )
        || (( $value == $end) && ( $this->me ==2 ) ) )
        {
        echo "<td bgcolor=#000000 > " ;
        }
        else { echo "<td bgcolor=#337878  > " ; }

    $d = beg ;
    $f = $end ;
    if ($this->me == 1 ) { $d = $value ;
            if ( $d > $end ) { $f = $d ; }
            else { $f = $end ; } }
            else
                { $f = $value ;
                if ( $f < $beg ) { $d = $f ; }
                else { $d = $beg ; } }
    if($value >= $aujourduis )
      echo " <a href='$goto?beg=$d&end=$f&cal=$this->me&c2=$c2&c1=$c1 ' > ".$n."</a></td>" ;
         else echo $n. "</td>" ;
        
        ++$n;
        $tbuff +=86400 ;
        }
    else
        {
        echo "<td > ? </td>" ;
        }
    if ( $nn % 7 ==0 ) echo "</tr> <tr>";
    }
echo "</tr>";
}


function draw ( $goto , $c1 , $c2 )
{
global $time , $beg , $end , $cal ;
setlocale ("LC_ALL", "fr_CA");

echo "<table   bgcolor=#6699CC  CELLSPACING ='0' BORDER='0' > \n<tr VALIGN=CENTER ALIGN=CENTER > \n
<td> " ;
if ( $this->me ==1 )
{
echo " <a href='$goto?cal=".$this->me."&c1=".($c1 - 86400*30) ."&c2=".$c2."&beg=$beg&end=$end'>  
   << </a> </td> \n <th bgcolor=#336699 >  ".strftime(" %B %Y" ,$c1 ) ." </th> \n <td>
  <a href='$goto?cal=".$this->me."&c1=".($c1 + 86400*30 )."&c2=$c2&beg=$beg&end=$end'>  >> </a> </td>
\n" ;
}
else
{
echo " <a href='$goto?cal=".$this->me."&c2=".($c2 - 86400*30 )."&c1=".$c1."&beg=$beg&end=$end'>  
   << </a> </td> \n <th bgcolor=#336699 > ". strftime(" %B %Y" ,$c2 ) ." </th> \n <td>
   <a href='$goto?cal=".$this->me."&c2=".($c2 + 86400*30 )."&c1=$c1&beg=$beg&end=$end'>  >> </a>
</td>  \n " ;
}

echo "  </tr>  <tr>
<td COLSPAN=3 >
<table BORDER=0 CELLSPACING=1 ALIGN='CENTER' WIDTH ='180' >
<TR  bgcolor=#336699  ><TH>L</TH><TH>M</TH><TH>M</TH><TH>J</TH><TH>V</TH><TH>S</TH><TH>D</TH></TH>
";                                        
$this->jj( $goto , $c1 , $c2 ) ;
echo "</table> </td> </tr></table> ";
}
}
// USAGE ( CODE fragment  )
// if( ! defined ("BZ_calendar") )  include  "lib/BZ_calendar.inc";
// if ( $time=='' ) $time = time();
// if ( !isset ($c1 )) $c1 = $time ;
// if ( !isset ($c2 )) $c2 = $time ;
// if (!isset ( $beg ) ) $beg = date("Y-m-d", $time);
// if (!isset ( $end ) ) $end = date("Y-m-d", $time);
// if ( $cal == 1 && $c2 < $c1 ) $c2 = $c1 ;
// if ( $cal == 2 && $c2 < $c1 ) $c1 = $c2 ;
// $cal1= new BZ_calendar     ( 1 , $beg , $end ) ;
// $cal2 = new BZ_calendar     ( 2 , $beg , $end ) ;
//
// $cal1->draw("test.php3" , $c1 ,$c2 );
//   
//  $cal2->draw("test.php3" , $c1 ,$c2 );
/// the first calendar select the start date , the second the end date )
// The query the database  whith  $beg and $end
//  enjoy ( but you have to change it a little to use the US date format )