Yahoo Mail script??

[HiredGoon]

Every so often on my Yahoo Mail, the below script tries to load and it just stops my whole system dead for a couple minutes until the box pops up asking if I want to continue to load the script or stop it. I choose stop and then it takes a short while for the system to get back to normal.

Any idea what this is and how to prevent it from even trying to load?

Script: mail.yimg.com/d/combo?/mg/6_0_18/js/yui_utils.js&/mg/6_0_18/js/core.js&bc/bc_2.0.4.js&/mg/6_0_18/js/darla.js&/mg/6_0_18/js/async.js&/ult/ylc_1.9.js&/mg/6_0_18/js/imboot.js&:1

Note: I removed the http:// from the above so the whole thing would show up here, otherwise it shortened it for the forum post.