function DoBench(x){
    var startTime,endTime,gORl='local';
    if(x==1){
        startTime=new Date().getTime();
        Bench1();
        endTime=new Date().getTime();
    }else{
        gORl='global';
        startTime=new Date().getTime();
        Bench2();
        endTime=new Date().getTime();
    }
alert('Elapsed time using '+gORl+' variable: '+((endTime-startTime)/1000)+' seconds.');
}