cannot access two animation parameters in blend tree animations in Humanoid ?

Hai to all.. iam trying to move a humanoid model using blend tree animation but i cannot access two animation parameters at a time in scriptin.....this is my objective.....i,e i have one human model and am trying to animate it that is idle,walk forward,walk left,walk right,run forward,run left,run right.....i designed the blendtree and assgined all the animation clips....now am trying to change the state via script.....animation state changes working properly....that is idle ,walk,run is working good....but turning animations are all not working...please give some basic ideas to move the run left run right,,,,,,,else give some example projects links which includes human animations using blend tree......try to give some script example......Thanks in advance....