var xmlHttp;
var url; 
var account_div;


function generateGraph(rate,term,loan,height,width)
{
	/*var width =  400;
	var height =  200;*/
	var url = "ajax_graph.php";
	account_div = document.getElementById("amortization_graph");
	
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
  	{
  		alert ("Unable to comply, your browser does not support AJAX!");
  		return;
  	}
  	
  	  	
  	url=url+"?width="+width;
	url=url+"&height="+height;
	url=url+"&rate="+rate;
	url=url+"&term="+term;
	url=url+"&loan="+loan;
	url=url+"&sid="+Math.random();
  	
  	get_data(url);
	
}

function get_data(url)
{
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
	
}

function post_data(url,param)
{
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("POST",url,true);
	xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
	xmlHttp.send(param);
}

function stateChanged() 
{ 	
	if (xmlHttp.readyState==4)
	{
		var responseText = xmlHttp.responseText;
		account_div.innerHTML=responseText;	
	}
	else
		account_div.innerHTML="<img src='images/loader.gif' />";		
}

function GetXmlHttpObject()
{
	var xmlHttp=null;
	try
	  {
	  // Firefox, Opera 8.0+, Safari
	  xmlHttp=new XMLHttpRequest();
	  }
	catch (e)
	  {
	  // Internet Explorer
	  try
	    {
	    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	    }
	  catch (e)
	    {
	    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	    }
	  }
	return xmlHttp;
}