function pause(millis)
{
var date = new Date();
var curDate = null;

do { curDate = new Date(); }
while(curDate-date < millis)
}
$("div.down").each(function(){

var self = $(this);

self.click();
pause(1000);

});

Untested

var stack = {
        delay: 1000,
        actions:[],
        run: function() {
                if (stack.actions.length) {
                        stack.actions.shift()();
                        setTimeout(stack.run, stack.delay);
                }
        }
};

$(elems).each(function(){
        var that = this;
        stack.actions.push(function(){
                $(that).dostuff();
        });
});

stack.run();