// toggle visibility

function toggle( targetId ){
  if (document.getElementById){
  		target = document.getElementById( targetId );
  			if (target.style.display == "none"){
  				target.style.display = "";
  			} else {
  				target.style.display = "none";
  			}
  	}
}


// switch styles

function setActiveStyleSheet(title) {
  var i, a, main;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("title") &&
        !a.disabled
        ) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if (a.getAttribute("rel") &&
        a.getAttribute("rel").indexOf("style") != -1 &&
        a.getAttribute("rel").indexOf("alt") == -1 &&
        a.getAttribute("title")
        ) return a.getAttribute("title");
  }
  return null;
}

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 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 buildSlug(sourceID, targetID) {
	var theSlug = '';
	if (document.getElementById(targetID).value == '') {
		theSlug = document.getElementById(sourceID).value;
		theSlug = theSlug.replace(/\s+/gi, '_');
		theSlug = theSlug.replace(/[^\w]/gi,'');
		document.getElementById(targetID).value = theSlug.toLowerCase();
	}
}

function openWindow(url, name, width, height, resize, scroll, center) {
	var sParams = '';
	name = (name == null) ? '' : name;

	sParams += 'width=' + width;
	sParams += ',height=' + height;
	sParams += (resize || resize == 'true') ? ',resizable=yes' : ',resizable=no';
	sParams += (scroll || scroll == 'true') ? ',scrollbars=yes' : ',scrollbars=no';
	sParams += (center || center == 'true') ? ',left=' + ((screen.width - width) / 2) : '';
	sParams += (center || center == 'true') ? ',top=' + ((screen.height - height) / 2) : '';

	window.name = 'opener';
	var popupWin = window.open(url, name, sParams);
	return popupWin;
}


function buildLinkName(firstnameid, lastnameid, linknameid) {
	var firstname = document.getElementById(firstnameid).value;
	var lastname = document.getElementById(lastnameid).value;
	var linkname = document.getElementById(linknameid).value;
	
	if ((linkname.length == 0) && (firstname.length > 0) && (lastname.length > 0)) {
		document.getElementById(linknameid).value = firstname.toLowerCase() + '_' + lastname.toLowerCase();
	}
}


surveyClicked = false;
function checkSurvey(form) { 
	for (i = 0; i < form.answer.length; i++) {
		if (form.answer[i].checked) {
			surveyClicked = true;
			return true;
		}
	}
	alert('Please make your selection\n');
	return false;
}

function getDHTMLObj(objName) {
	if (document.getElementById) {
		return document.getElementById(objName);
	} else if (document.all) {
		return document.all[objName];
	} else if (document.layers) {
		return document.layers[objName];
	} else {
		return null;
	}
} 

// for backward-compatability:
function JumpURL(selection) {
	var tempIndex = selection.selectedIndex;
	var selectedURL = selection.options[tempIndex].value;
	window.top.location.href = selectedURL;
}



window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);