Lo hago pero no me funciona!!!
Es mas me inutiliza el Select!!!
Código:
var groups=document.datos.IdArea.options.length
var group=new Array(groups)
for (i=0; i<groups; i++)
group[i]=new Array()
group[0][0]=new Option("","0")
<?
$A=mysql_query("SELECT IdArea,Area FROM areas ORDER BY Area");
$x=1;
while ($a=mysql_fetch_array ($A))
{
$y=0;
$C=mysql_query("SELECT IdSubArea,IdArea,SubArea FROM subareas WHERE IdArea='".$a['IdArea']."' AND SubArea!='Todas' ORDER BY SubArea");
while ($c=mysql_fetch_array ($C))
{
if($c['IdSubArea']==$CamposCursos['IdSubArea'])
$num=$c['IdSubArea'];
echo "group[".$x."][".$y."]=new Option (\"".$c['SubArea']."\",\"".$c['IdSubArea']."\")\n";
$y=$y+1;
}
$x=$x+1;
}
echo "document.datos.IdSubArea.selectedIndex=".$num;