LS

Iam able to add a and style a new search box by adding underlying to the layout master of my skin

<portal:SearchInput id="SearchInputBox1" runat="server"
  LinkOnly="false" 
  RenderAsListItem="false"
  ImageUrl="skinbase_magnifier.png"
  ButtonCssClass="searchbutton"
  TextboxCssClass="searchbox"
  OverrideWatermark="enter search terms"
  UseHeading="false"
  HideOnLoginPage="true"
  HideOnPasswordRecoveryPage="true"
  HideOnRegistrationPage="true"
  HideOnSearchResultsPage="true"
  HideOnSiteSettingsPage="true"
/>

But there is also a default search box of my site which is i think created by a j-script. 
I want to style this one but iam not able to find the file where i can change this. 
Tried to search but without any luck

We is able to help

Thx in regards