Problem in Using more than one directory in fuerte

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Hi everyone,

I have installed hydro and fuerte and having problem when i want to use more than one directory in fuerte. I have made 2 directories named,fuerte_workspace and ros_workspace, and added them to my bashrc. but my ROS doesn't seem to recognize my ros_workspace and I can just roscd to packages in fuerte_workspace. what shoul I do? Thanks for any help. My ending lines in bashrc are as follows:

 source `rospack find gazebo`/setup.bash
 source /opt/ros/fuerte/setup.bash
 export ROS_PAcKAGE_PATH=~/dev/rosbook:$ROS_PACKAGE_PATH
 export ROS_PACKAGE_PATH=~/ros_workspace:$ROS_PACKAGE_PATH
 export ROS_PACKAGE_PATH=~/fuerte_workspace/sandbox:$ROS_PACKAGE_PATH
 export ROS_PACKAGE_PATH=~/drh-robotics-ros/ros/ardros:$ROS_PACKAGE_PATH
 export ROS_PACKAGE_PATH=~/fuerte_workspace/sandbox/VSLAMDIR:$ROS_PACKAGE_PATH
 export ROS_PACKAGE_PATH=~/fuerte_workspace/sandbox/Navigation_Mohammad:$ROS_PACKAGE_PATH

 source /opt/ros/hydro/setup.bash
 source /opt/ros/hydro/setup.bash