Guitar tab help: How do I play this while muting these strings?

Here's the tab:





http://www.ultimate-guitar.com/tabs/b/bl...





Ok, the person the wrote it mistakenly put the wrong tuning, he says it's in "Open D" (DGDGBd), but I'm pretty sure that's Open G tuning. But the tuning isn't the issue.





Here's the first riff


d|-0----0-----------------0-----------...


b|-1h3-1-----------------1--3---------...


g|-------3--0-----0--3----------3-----...


d|-------0--0--3-----0----------0-----...


b|-0----0---------------------------0-...


d|------------------------------------...





Ok, so how am I supposed to hammer on 1 to 3 (C to D) while playing the 5th and 1st string open AND muting the 3rd and 4th strings. I'd appreciate it if someone would help me out.

Guitar tab help: How do I play this while muting these strings?
Don't use a pick, fingerpick instead.