Question

 <select name="cart" id="cart">
    <option value="1" selected="selected">visa</option>
    <option value="2">master</option>
    <option value="3">american</option>
 </select>

I want to be if visa selected my div #parent1 is show other divs are hide.
my jquery code

           $("#parent1,#parent2,#parent3").css("display","none"); 
           $("select").change(function() {
                if ($("select").val() == "1") {
                    $("#parent1").slideDown("fast"); //Slide Down Effect   
                    //$("#parent2,#parent3").css("display","none");

                 }
     });  

Answer 1

Something like:

$("#parent1,#parent2,#parent3").css("display","none"); 
$("select").change(function() {
    $("div[id^='parent']").hide();
    $("div[id='parent"+$(this).val()+"']").fadeIn("fast");
});