/* 
Detect browser height and ensure the bottom navigation always aligns to the bottom of the page.
*/
var isIE5=navigator.userAgent.toUpperCase().indexOf("MSIE 5")!=-1;
var targetElementID="mainContents", targetElementStyleOffset=70;

function adjustHeight() {
  if (document.getElementById) {
    var targetElement=document.getElementById(targetElementID),
        documentHeight, totalOffset;

    if (targetElement && document.documentElement.offsetHeight
        && targetElement.offsetHeight && targetElement.offsetTop) {
      documentHeight=document.documentElement.offsetHeight;
      if (targetElement.offsetHeight<documentHeight-targetElement.offsetTop) {
        if (isIE5)
          totalOffset=targetElement.offsetTop;
          else totalOffset=targetElement.offsetTop+targetElementStyleOffset;
        targetElement.style.height=String(documentHeight-totalOffset)+'px';
      }
    }
  }
}

function styleStarter() {
	var cookieData = readCookie('halifax_group');
	if (cookieData) {
		switchStyle(cookieData);
	} else {
		createCookie("halifax_group", 'main', 30);
		switchStyle('main');
	}
}
	
function switchStyle(name) {
	eraseCookie('halifax_group');
	createCookie("halifax_group", name, 30);
		
	var ss = document.getElementById("styles");
	ss.setAttribute ("href", "../stylesheets/" + name + ".css");
}	

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}