SHADOW EFFECT

Steps:

• Open the program "Adobe Photoshop CS3"
• Choose an object with File-Open-Select object
  
• Click Magnetic Lasso Tool for creating selection object
• create a new layer
• open new work sheet to save the selected object
• after that, back to the previous object and press Ctrl+D
• after the dashed line in object disappeared, now move the selected object to the previous object
• set the position of the object according the shadow shape that we want
• set the opacity of layer. for example the opacity of layer 2 is 60%, then do the same thing for layer 3 to make it more transparant.