<DIV class="alphaRed"></DIV>
<DIV class="alphaBlue"></DIV>

　CSS部分

.alphaRed
{
    background-color:red;
    width:7cm;
    height:6cm;
    filter:alpha(opacity=0, finishopacity=50, style=1, startx=200, starty=200, finishx=0, finishy=0);
    position:absolute;
    left:1cm;
    top:1cm
}

.alphaBlue
{
    background-color:blue;
    width:7cm;
    height:6cm;
    filter:alpha(opacity=0, finishopacity=50, style=1, startx=0, starty=0, finishx=200, finishy=200);
    position:absolute;
    left:1cm;
    top:1cm
}

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