Drop down bokse

Hej med jer.

Jeg har fundet nedenstående script jeg gerne vil benytte, men jeg er ikke så god til at kode, og har derfor har jeg 2 spørgsmål.
- HVAD BETYDER $, - og * TEGNENE I OPTION LINIERNE?
    data_2 = new Option("2", "$$");
    data_1_1 = new Option("11", "-");
    data_1_1_1 = new Option("111", "*");

Scriptet er taget herfra:
http://www.javascriptkit.com/script/script2/multiplecombo.shtml

- HVOR INDSÆTTER JEG SIDENAVNET SOM BRUGEREN SKAL LEDES HEN TIL NÅR EKSEMPELVIS MULIGHED 1_1_3 VÆLGES?



<script language="JavaScript" type="text/javascript">
<!--

/*
*** Multiple dynamic combo boxes
*** by Mirko Elviro, 9 Mar 2005
*** Script featured and available on JavaScript Kit (http://www.javascriptkit.com)
***
***Please do not remove this comment
*/

// This script supports an unlimited number of linked combo boxed
// Their id must be "combo_0", "combo_1", "combo_2" etc.
// Here you have to put the data that will fill the combo boxes
// ie. data_2_1 will be the first option in the second combo box
// when the first combo box has the second option selected


// first combo box

    data_1 = new Option("1", "$");
    data_2 = new Option("2", "$$");

// second combo box

    data_1_1 = new Option("11", "-");
    data_1_2 = new Option("12", "-");
    data_2_1 = new Option("21", "--");
    data_2_2 = new Option("22", "--");
    data_2_3 = new Option("23", "--");
    data_2_4 = new Option("24", "--");
    data_2_5 = new Option("25", "--");

// third combo box

    data_1_1_1 = new Option("111", "*");
    data_1_1_2 = new Option("112", "*");
    data_1_1_3 = new Option("113", "*");
    data_1_2_1 = new Option("121", "*");
    data_1_2_2 = new Option("122", "*");
    data_1_2_3 = new Option("123", "*");
    data_1_2_4 = new Option("124", "*");
    data_2_1_1 = new Option("211", "**");
    data_2_1_2 = new Option("212", "**");
    data_2_2_1 = new Option("221", "**");
    data_2_2_2 = new Option("222", "**");
    data_2_3_1 = new Option("231", "***");
    data_2_3_2 = new Option("232", "***");

// fourth combo box

    data_2_2_1_1 = new Option("2211","%")
    data_2_2_1_2 = new Option("2212","%%")

// other parameters

    displaywhenempty=""
    valuewhenempty=-1

    displaywhennotempty="-select-"
    valuewhennotempty=0


function change(currentbox) {
    numb = currentbox.id.split("_");
    currentbox = numb[1];

    i=parseInt(currentbox)+1

// I empty all combo boxes following the current one

    while ((eval("typeof(document.getElementById(\"combo_"+i+"\"))!='undefined'")) &&
          (document.getElementById("combo_"+i)!=null)) {
        son = document.getElementById("combo_"+i);
        // I empty all options except the first one (it isn't allowed)
        for (m=son.options.length-1;m>0;m--) son.options[m]=null;
        // I reset the first option
        son.options[0]=new Option(displaywhenempty,valuewhenempty)
        i=i+1
    }


// now I create the string with the "base" name ("stringa"), ie. "data_1_0"
// to which I'll add _0,_1,_2,_3 etc to obtain the name of the combo box to fill

    stringa='data'
    i=0
    while ((eval("typeof(document.getElementById(\"combo_"+i+"\"))!='undefined'")) &&
          (document.getElementById("combo_"+i)!=null)) {
          eval("stringa=stringa+'_'+document.getElementById(\"combo_"+i+"\").selectedIndex")
          if (i==currentbox) break;
          i=i+1
    }


// filling the "son" combo (if exists)

    following=parseInt(currentbox)+1

    if ((eval("typeof(document.getElementById(\"combo_"+following+"\"))!='undefined'")) &&
      (document.getElementById("combo_"+following)!=null)) {
      son = document.getElementById("combo_"+following);
      stringa=stringa+"_"
      i=0
      while ((eval("typeof("+stringa+i+")!='undefined'")) || (i==0)) {

      // if there are no options, I empty the first option of the "son" combo
      // otherwise I put "-select-" in it

            if ((i==0) && eval("typeof("+stringa+"0)=='undefined'"))
                if (eval("typeof("+stringa+"1)=='undefined'"))
                  eval("son.options[0]=new Option(displaywhenempty,valuewhenempty)")
                else
                eval("son.options[0]=new Option(displaywhennotempty,valuewhennotempty)")
          else
              eval("son.options["+i+"]=new Option("+stringa+i+".text,"+stringa+i+".value)")
          i=i+1
      }
      //son.focus()
      i=1
      combostatus=''
      cstatus=stringa.split("_")
      while (cstatus[i]!=null) {
          combostatus=combostatus+cstatus[i]
          i=i+1
          }
      return combostatus;
    }
}

//-->
</script>

<form>
<select name="combo0" id="combo_0" onChange="change(this);" style="width:200px;">
    <option value="value1">-select-</option>
    <option value="value2">1</option>
    <option value="value3">2</option>

</select>
<BR><BR>
<select name="combo1" id="combo_1" onChange="change(this)" style="width:200px;">
    <option value="value1">  </option>
</select>
<BR><BR>
<select name="combo2" id="combo_2" onChange="change(this);" style="width:200px;">
    <option value="value1">  </option>
</select>
<BR><BR>
<select name="combo3" id="combo_3" onChange="change(this);" style="width:200px;">
    <option value="value1">  </option>

</select>

</form>

<p align="center"><font face="arial" size="-2">This free script provided by</font><br>
<font face="arial, helvetica" size="-2"><a href="http://javascriptkit.com">JavaScript
Kit</a></font></p>