PLatformer

he all im working on this little platformer, im not very far through yet i’ve got the guy animated and moving, ive got the platform suporting him, (the horizontle platform) but i cant seem to make it so he cant run through the verticle platform, here is my code

//if the guy is touching the platform
if ( hitTest(_root.platform) && jump == 0 && moveY > 0) {
moveY = 0;
//allign the guy to the top of the platform
while (hitTest(_root.platform) ) {
_y–;
}
any help will be apreciated