I suspect your PC is infected, and I would recommend scanning it with a good anti-virus program. The code on our site has nothing to do with what you're experiencing.
Since my last post earlier this morning, I have done nothing just been sat watching television, Fifth Gear actually.
Google was sat there doing nothing, just on its home page.
I have just come back to my pc to check my mailwasher, (which was not running] and yes you guessed it, I have a "java-script Alert".
The top bar reads
java-script Alert - w w w .23412... [ please exclude the three spaces for the url address ]
Messge body reads
>> [then Chinese characters which I can't read]
I am now going to take a screen shot and save it for reference later.
Something that might be of interest, it measures 70mm long by 35mm high.
They have come in all sizes.
Oh by the way I never push the OK button on any of them.