/* */
// function used to rotate the header images
/* */
function rotateHeaderImage(delay, firstImage, secondImage, maxImage)
{
	var nextImage;
	var firstImageName = 'headerimage' + firstImage;
	var secondImageName = 'headerimage' + secondImage;
	
	var firstImage = parseInt(firstImage);
	var secondImage = parseInt(secondImage);
	var maxImage = parseInt(maxImage);
	
	// establish which image should be shown next, increment or start again
	if(secondImage<maxImage)
	{
		nextImage = secondImage + 1;
	}else{
		nextImage = 1;
	}// end if secondImage<maxImage
	
	// call function to hide the current (first) header image
	// and show the next (second) header image
	$(firstImageName).fade(); 
	$(secondImageName).appear();
			
	// call the script again to continue with the rotation		
	setTimeout('rotateHeaderImage(' + delay + ', ' + secondImage + ', ' + nextImage + ', ' + maxImage + ')',delay);
}// end function rotateHeaderImage()


/* */
// function to make an element appear and disappear
/* */
function changeDisplay(obj)
{
	var el = document.getElementById(obj);
	
	if ( el.style.display == "none" ) 
	{
		// show the element
		el.style.display = '';		
	}else {
		// make the element disappear
		el.style.display = 'none';
	}// end if else
}// end functon changeDisplay()


/* */
// function to make calendar month elements appear and disappear
/* */
function changeCalendarDisplay(obj, numItems)
{
	// hide all elements
	var i=1;
	var numItems = numItems;
	
	for (i=1;i<=numItems;i++)
	{
		var el = document.getElementById('month' + i);
		el.style.display = 'none';
	}

	var el = document.getElementById(obj);
	
	if ( el.style.display == "none" ) 
	{
		// show the element at the mouse pointer
		el.style.display = '';
		
	}else {
		// make the element disappear
		el.style.display = 'none';
	}// end if else !=
}// end functon changeDisplay()

/* */
/* Ajax Function to Call PHP Script */
/* */

function ajaxFunction(targetObj, script)
{
	var xmlHttp;

	try
	{  
		// Firefox, Opera 8.0+, Safari  
		xmlHttp=new XMLHttpRequest();  
	}
	catch (e)
	{  
		// Internet Explorer  
		try
		{    
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");    
		}
		catch (e)
		{    
			try
			{      
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");      
			}
			catch (e)
			{      
				alert("Your browser does not support AJAX!");      
				return false;      
			}    
		}  
	}

	xmlHttp.onreadystatechange=function()
	{
		if(xmlHttp.readyState==4)
		{
			document.getElementById(targetObj).innerHTML=xmlHttp.responseText;
			// alert(xmlHttp.responseText);
		}
	}

	xmlHttp.open("POST",script,true);
	xmlHttp.send(null);	  		
}// end function