How do I use JavaScript (or ASP) to change enable a disabled form element?

How do I use JavaScript (or ASP) to change enable a disabled form element, based on the option selected in the previous drop-down menu? I have two drop-down menus, and only want the second to be enabled if certain options are selected on the first option.


thanks!How do I use JavaScript (or ASP) to change enable a disabled form element?
Basically you just need to write a function that handles the Select element's OnChange event:





function Verify()


{


//Find the selected ID


var SelectedID = document.getElementById( 'lstOne' ).value





if (SelectedID == -1 || SelectedID == 3)


{


//Disable the second list


document.getElementById( 'lstTwo' ).disabled = true;


}


else


{


//Enable the second list


document.getElementById( 'lstTwo' ).disabled = false;


}


}





Your form will simply look like this:





%26lt;form%26gt;


%26lt;select OnChange=';Verify()'; id=';lstOne';%26gt;


%26lt;option value=';-1'; selected%26gt;Please select a number%26lt;/option%26gt;


%26lt;option value=';1';%26gt;1%26lt;/option%26gt;


%26lt;option value=';2';%26gt;2%26lt;/option%26gt;


%26lt;option value=';3';%26gt;3%26lt;/option%26gt;


%26lt;option value=';4';%26gt;4%26lt;/option%26gt;


%26lt;/select%26gt;





%26lt;select id=';lstTwo'; disabled=';True';%26gt;


%26lt;option value=';Ford';%26gt;Ford%26lt;/option%26gt;


%26lt;option value=';Chevy';%26gt;Chevy%26lt;/option%26gt;


%26lt;option value=';Honda';%26gt;Honda%26lt;/option%26gt;


%26lt;option value=';Toyota';%26gt;Toyota%26lt;/option%26gt;


%26lt;/select%26gt;


%26lt;/form%26gt;