This method is called when the current location is about to be changed.
<p>
<p>The following fields in the <code>LocationEvent</code> apply:
<ul>
<li>(in) location the location to be loaded
<li>(in) widget the <code>Browser</code> whose location is changing
<li>(in/out) doit can be set to <code>false</code> to prevent the location
from being loaded
</ul>
@param event the <code>LocationEvent</code> that specifies the location
to be loaded by a <code>Browser</code>
This method is called when the current location is about to be changed. <p>
<p>The following fields in the <code>LocationEvent</code> apply: <ul> <li>(in) location the location to be loaded <li>(in) widget the <code>Browser</code> whose location is changing <li>(in/out) doit can be set to <code>false</code> to prevent the location from being loaded </ul>
@param event the <code>LocationEvent</code> that specifies the location to be loaded by a <code>Browser</code>
@since 3.0