phpeveryday.com

  var param1 = document.getElementById("param1").value;
  var param2 = document.getElementById("param2").value;
  
  var params = "param1=" + param1 + "¶m2=" + param2";
	  
  xmlHttp.open("Get","calculation.php?" + params, true);
  xmlHttp.onreadystatechange = handleRequestStateChange;
  xmlHttp.send(null);

Line 1 & 2, we send two parameter: param1 and param2.

Then, line 4, we create a line for finishing the url.

Ok, next post, we will see simple implementation of this.