2 D Array

I have been having problems initliasing a 2 dimensional array…

var urls:Array=new Array();
for(i=0;i<3;i++)
{
for(k=0;k<3;k++)
{
trace(urls*[k]);
}
}

when i do the trace i get “undefined”
i have tried everything… how do i declare and initialise a 2 dimensional array ???
Manish