left_pic = new Image();
right_pic = new Image();

function over_left()
{

     left_pic = document.getElementById("left_pic");
     right_pic = document.getElementById("right_pic");

     left_pic.src = "new_index/left_select_left.jpg";
     right_pic.src = "new_index/left_select_right.jpg";
}

function over_right()
{
     left_pic = document.getElementById("left_pic");
     right_pic = document.getElementById("right_pic");

     left_pic.src = "new_index/right_select_left.jpg";
     right_pic.src = "new_index/right_select_right.jpg";
}

function normal_link()
{
     left_pic = document.getElementById("left_pic");
     right_pic = document.getElementById("right_pic");

     left_pic.src = "new_index/side_left.jpg";
     right_pic.src = "new_index/side_right.jpg";
}