function distance(){

var $x=top.document.hoeveel.x.value;
var $y=top.document.hoeveel.y.value;
$y=parseInt($y);
if ( $x < $y ){
 var $t=$x; 
 $x=$y;
 $y=$t;
} 
var MainList=new Array(3);
MainList[0]=['0'];
MainList[1]=['1680','0'];
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MainList[3]=['1510','2461','99','0'];
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var $res=MainList[$x][$y];
document.hoeveel.result.value=$res;
}