html图片宽度高度等比例绽放 css图片自动绽放大小 左右 上下居中

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.pic

{

max-height:400px;

max-width:400px;

_width:expression("400px");

_height:expression((document.documentElement.clientHeight||document.body.clientHeight)>400?"400px":"");

/*_width:expression((document.documentElement.clientWidth||document.body.clientWidth)>(document.documentElement.clientHeight||document.body.clientHeight)?"400px":"");*/

/*_height:expression(document.documentElement.clientWidth>document.documentElement.clientHeight?(document.documentElement.clientHeight*(400*2-68)/document.documentElement.clientWidth+"px"):"400px");*/

overflow:hidden;

margin-left:-55px;

margin-Right:-55px;

padding:0px;

}

table

{

width:400px;

height:400px;

border:0px;

border-collapse:collapse;

margin:0px;

padding:0px;

}

tr

{

margin:0px;

padding:0px;

width:400px;

height:400px;

}

td

{

text-align:center;

margin:0px;

padding:0px;

width:400px;

height:400px;

}