combobox validation in javascript

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 how to validate for 3 combo boxes using javascript  
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  <script type="text/javascript">  
     function onChange(obj) {  
       var txtPRNO = document.getElementById("<%=txtPRNO.ClientID %>");  
       var cbAuth1 = document.getElementById('<%=cbAuthoriser1.ClientId%>');  
       var cbAuth2 = document.getElementById('<%=cbAuthoriser2.ClientId%>');  
       var cbAuth3 = document.getElementById('<%=cbAuthoriser3.ClientId%>');  
       if (obj == 1) {  
         if (cbAuth1.value != "0") {  
           if (cbAuth1.value == cbAuth2.value || cbAuth1.value == cbAuth3.value) {  
             alert("Authoriser already selected. Plese selected another one. ");  
             document.getElementById('<% =btndummy.ClientID %>').click();  
             cbAuth1.focus();  
             return false;  
           }  
           return false;  
         }  
       }  
       if (obj == 2) {  
         if (cbAuth2.value != "0") {  
           if (cbAuth2.value == cbAuth1.value || cbAuth2.value == cbAuth3.value) {  
             alert("Authoriser already selected. Plese selected another one. ");  
             document.getElementById('<% =btndummy1.ClientID %>').click();  
             cbAuth2.focus();  
             return false;  
           }  
           return false;  
         }  
       }  
       if (obj == 3) {  
         if (cbAuth3.value != "0") {  
           if (cbAuth3.value == cbAuth1.value || cbAuth3.value == cbAuth2.value) {  
             alert("Authoriser already selected. Plese selected another one. ");  
             document.getElementById('<% =btndummy2.ClientID %>').click();  
             cbAuth3.focus();  
             return false;  
           }  
           return false;  
         }  
       }  
       return true;  
     }  
   </script>  

 if you want more related search please click here  
 please help to other  
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