Sorry, my English is no good, but i really need help

Here is my project (fangame)

i958.photobucket.com/albums/ae65/AkiyamaGX/z.png

But i dont know how to make my character can run on platform like this

i958.photobucket.com/albums/ae65/AkiyamaGX/slope.gif

Im using a ground detector like this

i958.photobucket.com/albums/ae65/AkiyamaGX/ground.png

Please help me, i need a tutorial or something like this
Thanks