var name=prompt("Please enter your name","");
var age=prompt("Please enter your age","");

if (name){  
	document.write("Your name is "+ name + ".  "); 
 }
 else{
 	alert("You did not enter your name");
 }
 if (age){
 	document.write("Your age is " + age + ".  ");
 }
 else{
 	alert("You did not enter your age");
 }
 
 document.write("Thanks for playing!");