<script language="JavaScript" type="text/JavaScript">   

function combo_dinamico(){   

Combo1 = document.combo.estados; 

Combo2 = document.combo.cidades;

var url;   

url = 'combo2.php?estado='+Combo1[Combo1.selectedIndex].value;   

Combo2.options.length = 0;   

addItem(Combo2,"Aguarde...o combo está sendo carregado","",false,Combo2.length)   

meuIframe.location = url;   

Combo2.focus()   

}   

function inicia(){   

local1 = new Array();   

var maximo1, i;   

local1 = meuIframe.loc;   

maximo1 = local1.length;   

Combo2.options.length = 0;   

addItem(Combo2,'TODAS AS CIDADES','',false,Combo2.length);   

for (i=0;i<maximo1;i++){   

addItem(Combo2,local1[i][1],local1[i][0],false,Combo2.length);   

}   

}   

function addItem(obj,strText,strValue,blSel,intPos){    

     var newOpt,i,ArTemp,selIndex;    

     selIndex = (blSel)?intPos:obj.selectedIndex;    

     newOpt = new Option(strText,strValue);    

     Len = obj.options.length+1    

     if (intPos > Len) return    

     obj.options.length = Len    

     if (intPos != Len) {    

          ArTemp = new Array();    

          for(i=intPos;i<obj.options.length-1;i++)    

               ArTemp[i] = Array(obj.options[i].text,obj.options[i].value);    

          for(i=intPos+1;i<Len;i++)    

               obj.options[i] = new Option(ArTemp[i-1][0],ArTemp[i-1][1]);    

     }    

     obj.options[intPos] = newOpt;    

     if (selIndex > intPos)    

          obj.selectedIndex = selIndex+1;    

     else if (selIndex == intPos)     

          obj.selectedIndex = intPos;    

}

</script>