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function resizepic(o)
{
var maxwidth=550; //¶¨Òå×î´ó¿í¶È
var maxheight=800; //¶¨Òå×î´ó¸ß¶È
var a=new Image();
a.src=o.src
if( a.width<1 || a.height<1 )
return;
var f1 = 1.0*maxwidth/a.width
var f2 = 1.0*maxheight/a.height
if(a.width > maxwidth && f1<f2)
{
o.style.width=maxwidth;
}
if (a.height> maxheight && f1>=f2 )
{
o.style.height=maxheight;
}
}
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