function calcPrice(rate,weeks){
    var cost = rate * weeks;
    return cost;
}

function chooseAd(){
    var randnum01 = Math.floor(Math.random()*1000000);
    //document.getElementById('ad_result').innerHTML = "One moment please..";
    ajaxpage("/ajax_choosead.php?r="+randnum01+"&adtype="+document.getElementById('ad_type').value, "ad_result");
}

var xmlrequest=false;
/*@cc_on @*/
/*@if (@_jscript_version >= 5)
// JScript gives us Conditional compilation, we can cope with old IE versions.
// and security blocked creation of the objects.
 try {
  xmlrequest = new ActiveXObject("Msxml2.XMLHTTP");
 } catch (e) {
  try {
   xmlrequest = new ActiveXObject("Microsoft.XMLHTTP");
  } catch (E) {
   xmlrequest = false;
  }
 }
@end @*/
if (!xmlrequest && typeof XMLHttpRequest!='undefined') {
	try {
		xmlrequest = new XMLHttpRequest();
	} catch (e) {
		xmlrequest=false;
	}
}
if (!xmlrequest && window.createRequest) {
	try {
		xmlrequest = window.createRequest();
	} catch (e) {
		xmlrequest=false;
	}
}