Javascript select boxes based on previous selection

How can I ensure that this d开发者_如何学Gooes NOT open in a new window??

onclick="ob=this.form.table;window.open(ob.options[ob.selectedIndex].value)"/>

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if you want it open in a same window you need to write

onclick="ob=this.form.table;window.location.href=(ob.options[ob.selectedIndex].value)"/>

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You should replace it with:

onclick="ob=this.form.table;document.location=ob.options[ob.selectedIndex].value;"/>

Window.open() opens a new window; document.location changes the page in the current window.

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Do you want it to open in the same window?

if so use window.location