unknown spider

This is a little spider me and my hubby found in the doorway of our house! It's about the size of a penny while crawling. The pictures aren't very clear I took it with my web cam but it's legs look the same as a marbled orbweaver but its body is completely different. The middle of the spidey is a dull yellow with a brown stripe through it and it's butt is brown with two pointed bumps on it. If anyone knows what this spider is please let me know I would like to make sure it's not poisonous (I'm sure it's not) but I want to be careful I have three small kids and I've never seen one like it before.Thanks in advance.