// JavaScript Document

function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=300,height=500');");
}



// Carbon Calculator
function carbonCalc() {
	var kwh_monthly = document.getElementById("kwh_monthly");
	var kwh_annual = document.getElementById("kwh_annual");
	var mwh_new = document.getElementById("mwh_new");
	var regional_dpr = document.getElementById("regional_dpr");
	var co2_annual = document.getElementById("co2_annual");
	var co2_metrictons = document.getElementById("co2_metrictons");
	var treeseq_annual = document.getElementById("treeseq_annual");
	
	var yearly = kwh_monthly.value * 12;
	var mwh = yearly / 1000;
	var dpr = regional_dpr.value;
	var co2lbs = mwh * dpr;
	var co2ton = co2lbs / 2204.6;
	var trees = co2lbs / 16.65;
	
	treeseq_annual.value = Math.round(trees);
	co2_metrictons.value = Math.round(co2ton);
	co2_annual.value = Math.round(co2lbs);
	mwh_new.value = Math.round(mwh);
	kwh_annual.value = Math.round(yearly);
	}



// Open links in external window for XHTML 1.0 Strict compliancy
// To make a link open in external window add the "rel" attribute to the <a> tag
// and set its value to "external" example:
//     <a href="http://www.google.com" rel="external">Google</a>
function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;


function cOver(elem) {
	var newImage = elem.firstChild.src.replace("_i.","_o.");
	elem.firstChild.src = newImage;
	elem.parentNode.style.backgroundColor = "#e2e2e2";
}

function cOut(elem) {
	var newImage = elem.firstChild.src.replace("_o.","_i.");
	elem.firstChild.src = newImage;
	elem.parentNode.style.backgroundColor = "#ffffff";
}