function doprice(num) {
switch(num) {
case 0 : return (""); break;
case 1 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 460 + (timeleft * 168);
         return (price); break;
case 2 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 1640 + (timeleft * 312);
         return (price); break;
case 3 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 2880 + (timeleft * 504);
         return (price); break;
case 4 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 3520 + (timeleft * 816);
         return (price); break;
case 5 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 6000 + (timeleft * 1200);
         return (price); break;

case 7 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 0 - 480 + (timeleft * 1616);
         return (price); break;
case 8 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 6000 + (timeleft * 2400);
         return (price); break;
case 9 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 4520 + (timeleft * 2616);
         return (price); break;


case 11 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 490 + (timeleft * 240);
         return (price); break;
case 12 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 972 + (timeleft * 672);
         return (price); break;
case 13 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 2460+ (timeleft * 960);
         return (price); break;
case 14 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 2950 + (timeleft * 1200);
         return (price); break;
case 15 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 4930 + (timeleft * 1680);
         return (price); break;
case 16 : var timeleft = prompt("Please enter days left on the paz:", "");
         price = 9900 + (timeleft * 2400);
         return (price); break;

   }
}