var card = new Array(500); 

function shuffle(r)
{var i=0;var j=0;var k=0;var p = r;var q = new Array(500);for(i=1; i<=p; i++) {q[i]=i;card[i]=0;}j=1;while(p>0){k=0;while(k==0) {k= Math.round((Math.random() *p)+0.5);}card[j]=q[k];for(i=k; i<p; i++) q[i]=q[i+1];p--;j++;}return;}