I want to change the select box on the cart screen to a text box.

$body.='<select name="number" id="";
// Onchange function is performed when combo box contents are changed
$body.=$row["ID"].'onchange="changeNumber(this);">';
// Convert quantities to numbers
$qty=(int)$row["quantity"];

for($number=0;$number<=10;$number++){
    $body.='<option';

    if($number==$qty){
        $body.='selected value=''.$number.'>'.$number.'</option>';
    } else{
        $body.='value=''.$number.'>'.$number.'</option>';
    }
}

$body.='</select>';