// Visitor Unit Preference Script
	// Developed by B. R. Stephen Peer
	// June 10, 2011

	$(document).ready(function() { 
		var myUnits = getCookie('units');
		if (myUnits != '') {
			setUnits(myUnits);
		} else {
			setCookie('units','english',365,'/');
		}
	});
	
	function setCookie(c_name,value,expiredays, path) {
		var exdate=new Date();
		exdate.setDate(exdate.getDate()+expiredays);
		document.cookie=c_name+ "=" +escape(value)+((path) ? ";path="+path : "") + ((expiredays==null) ? "" : ";expires="+exdate.toUTCString());
	}
	
	function getCookie(c_name) {
		if (document.cookie.length>0) {
			c_start=document.cookie.indexOf(c_name + "=");
			if (c_start!=-1) {
				c_start=c_start + c_name.length+1;
				c_end=document.cookie.indexOf(";",c_start);
				if (c_end==-1) c_end=document.cookie.length;
				return unescape(document.cookie.substring(c_start,c_end));
			}
		}
		return '';
	}
	
	function setUnits (theUnits) {
		if (!document.getElementById('metric')) {
		} else {
			if (theUnits == 'english') {
				document.getElementById('metric').style.display='none';
				document.getElementById('english').style.display='inline';
				document.getElementById('units_e').checked=true;
				document.getElementById('units_m').checked=false;
			} else {
				document.getElementById('english').style.display='none';
				document.getElementById('metric').style.display='inline';
				document.getElementById('units_e').checked=false;
				document.getElementById('units_m').checked=true;
			}
		}
		setCookie('units',theUnits,365,'/');
	}