//
// page forward and backwards logic for Mindful Medicine site
// created by jim adams on 11/01/2009
//
document.onkeydown = function(e){
	var e = window.event || e
	var url = document.URL;
	var len = url.length;
	var page ='';
	
	var lastbyte = url.substr(len-1, 1);
	var index = url.substr(len-9,5);
	
	if (lastbyte == '/' || index=='index')
		page = "1";
	else
		page = url.substr(len - 6, 2);
	
	if (e.keyCode == 34 || e.keyCode == 40) 
		page++;
	if (e.keyCode == 33 || e.keyCode == 38) 
		page--;
	
	if (page <= 0) 
		page = '17';
	 
	if (page > 20) 
		page = '1';
	
	if (page < 10) 
		page = '0' + page;

	// Key tester
	//alert("KeyCode: "+e.keyCode +" Char: " + String.fromCharCode(e.keyCode) + "\n" + url + "\n" + newurl);
	
	if (e.keyCode == 33 || e.keyCode == 34 || e.keyCode == 38|| e.keyCode == 40) 
	{
		if (page == '01' || page == '1')
			var newurl = 'http://www.mindfulmedicine.com/index.php';
		else
			var newurl = 'http://www.mindfulmedicine.com/p' + page + '.php';
		window.open(newurl, '_parent', '');		
	}
}