Google mail keeps popping up windows

[greenhorn]

Hi All,

I am having a weird problem since two days. I keep my google mail open whole day as it refreshes itself and I get to know about the new mails.

But now if I keep Gmail open and work on other windows, Gmail keeps popping up windows which has nothing but this hexadecimal something

"7cca69475363026330a0d99468e88d23ce95e222591126443015f5f462d9a177186c8701fb45a6ffee0daf1a178fc0f58cd309308fba7e6f011ac38c9cdd4580760f1d4560a84d5ca0355ecbbed2ab715a3350fe0c479050640bd0e77acec90c58c4d3dd0f5cf8d4510e68c8b12e087bd88cad349aafd2ab16b07b0b1b8276091217a44a9fe92fedacffff48092ee693af "

The URL in the new browser window is

"http://b.mail.google.com/mail/notifier/notify?&at=7edb6eb29d5ef27a-1092f9603a6&RID=rpc&SID=4C6DC19D09A0095C&CLOSEIMMEDIATELY=1&AID=0&TYPE=html&zx=rzk8b8zcq1q5&DOMAIN=mail.google.com&bcsi_scan_A645A1DE57B5D047=jkXHqY3ict6sgU237qWNdicAAADl/Esj"

The most weird thing is that when I go back home and use the internet at my home, this problem does not occur. It happens only at my office internet.

I am going nuts ! , please help

Thanks in advance.