How can I detect when an iframe page begins loading?

[thelanman]

I'd like for the opener of an iframe to be able to detect each time the user changes pages within that iframe. Using jQuery, I can detect each time a page finishes loading within an iframe via the following:\[code\]$('#myIframe').on('load', function() {/*do stuff*/});\[/code\]However, I'd also like to detect (in the iframe opener) each time a page starts loading within that iframe.Note: The content that is displayed in the iframe is from a third-party site, so I don't have the ability to insert code there so that the iframe can explicitly alert the opener.Does anyone know of an event that is fired when a page begins loading? I'm not having much luck finding anything via Internet searches, as most people seem to only be interested in detecting when the iframe has finished loading.