CSS Set Layer div transparency

1. Style Code

#layout {position:absolute; top:50px; width:500px; Background: #fff; Filter:alpha (opacity=70); opacity:0.7;}

1. Pop-up window appears gray transparent background, the content layer can not operate.

Define two layers:
<div style= "background:red; Filter:alpha (opacity=45); opacity:0.45; position:absolute;top:0px;left:0px; width:100%; height:100%; " ></div>
<div style= "Position:absolute;" > Content </div>

2. Define your layer with the style sheet below
. Alpha {Filter:alpha (opacity=50, finishopacity=50, style=0, startx=0, starty=0, finishx=100, finishy=100}
Explain:
Opacity= starting opacity (100 is opaque)
Finishopacity= the end of the opacity (100 of the words will not be transparent)
Style= style, starting from 0, 1.2.3 ... have even transparent ah, radiation shape transparent ah ...
Startx= begins the transparent x-coordinate, basically the picture, the upper-left corner of the layer (0)
Starty= begins the transparent y-coordinate, which is basically the picture, the upper-left corner of the layer (0)
finishx= end transparent x coordinate, basically also picture, bottom right of layer (picture, width of layer)
Finishy= ends the transparent y-coordinate, which is basically the picture, the lower-right corner of the layer (picture, height of the layer)