Problem Populating DRop Downs

Hi,
I am sorry if I am in the worng forum. Please point me to the corect forum.
However, here is my problem . I have two arrays
array1 ["a1", "a2", "a3", "a4"]
array2 ["a3", "a4", "a1", "a2"]
I need to populate a drop down on the basis of array1 but select default values on the basis of array2. How can u do that?
I am using a String to write out the DHTML as in:
str += "<option value=\"" + value + "\" >" + display + "</option>";
Thanks and Regards

This can be done by following approach
<script language="Javascript">
//array1 ["a1", "a2", "a3", "a4"]
//array2 ["a3", "a4", "a1", "a2"]
var array1=new Array();
var array2=new Array();
array1[0]="a1";
array1[1]="a2";
array1[2]="a3";
array1[3]="a4";
array2[0]="a3";
array2[1]="a4";
var x;
var str;
var y;;
var str = "<SELECT name=\"selA\" multiple>";
for (x in array1)
     var check = 0;
     for (y in array2)
          if(array1[x]==array2[y])
               str = str + "<option value=\"" + array1[x]+ "\" selected>" + array1[x]+ "</option>";
               check = 1;               
               break;
     if(check==0)
          str = str + "<option value=\"" + array1[x]+ "\" >" + array1[x]+ "</option>";
str += "</SELECT>";
document.write(str);
</script>-------------------------------
The above is the Java script approach..
Hope this helps.

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