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var a=[];
a[100]=[1,2,3,4];
alert(a.length)
<script>
var sz=new Array();
sz[0]=new Array(1,2,"3");
sz[1]=new Array("a","b");
sz[2]=new Array("x","y","z","m");
sz[3]=3;
x=sz[0][0];
y=sz[0][1];
z=sz[0][2];
alert(x);
alert(y);
alert(z);
alert(typeof(x));
</script>
var sz=new Array();
sz[0]=new Array(1,2,"3");
sz[1]=new Array("a","b");
sz[2]=new Array("x","y","z","m");
sz[3]=3;
x=sz[0,0];
alert(x);
alert(typeof(x));