Fix the show effect of task info page

In this version, if line in the table is too long, it displays badly. Now, it displays better in ie8, firefox & chrome. I'm not a professional front-end web developer, so just fix it in 3 browsers mentioned before.
Before:
![_002](https://f.cloud.github.com/assets/1232624/528675/a2b88e8a-c127-11e2-8ad0-3e7d5e2c61d6.png)
After:
![_001](https://f.cloud.github.com/assets/1232624/528676/a8340218-c127-11e2-9792-978f98c1b9b8.png)