Short of constructing your own using DOM methods and Input elements: No.

It is only possible by asking user to provide multiple data with delimeters e.g. input1 input2 input1,input2

and you can describe the format in prompt box message.

    var number = new Array(10);
    var total; //create a variable for your total
    var average; //create a variable for your average
    for(var i=0; i<10; i++) 
    {
    var number[i] = prompt("PLEASE ENTER A NUMBER"); //make sure all the 
                                                     //numbers have their 
                                                     //own ids which is 'i' 
                                                     //in this case
    total +=  parseInt(number); //this basically means total = previoustotal        
             //+ newly parsed number
    }

    average = total/10; //leave this outside because you want to do the 
                        //calculations at the end

    for(var i=0; i < number.length ; i++)
    {
    document.write("The difference from the average for the number," +
    number[i] + "is equal to " + (number[i] - average) +  "<br>");
    } //this will print out a difference output for all 10 numbers you 
      //inputted

Not sure how your CSS and HTML was made so i'll just leave the br in there

You can get only one input using prompt. You will either have to display multiple prompts or implement a custom dialog window which will basically be a form.