body {max-width:640px; min-width:320px; background-color:#f4f4f4;}
* {margin:0px; padding:0px;}
.left {float:left}
.right { float:right;}
.clear { clear:both;}
a:link { color:#50504f;text-decoration:none;background:none}/*ͨʽ*/
a:visited { color:#50504f;text-decoration:none; background:none}
a:hover { color:#50504f; text-decoration:none;background:none}
a:active { color:#50504f;text-decoration:none;background:none}
ul { list-style:none; float:left;}
ul li { float:left;}
input,textarea,select{outline: none;border: none;background-color:transparent;}