//var doAlerts=false;
function changeSheets(whichSheet){
  SaveText(whichSheet);
  if(document.styleSheets){
    var c = document.styleSheets.length;
   // if (doAlerts) alert('Change to Style '+(whichSheet+1));
    for(var i=0;i<c-1;i++){
      if(i!=whichSheet){
        document.styleSheets[i].disabled=true;
      }else{
        document.styleSheets[i].disabled=false;
      }
    }
  }
}

function invertSheets(){
	//alert(' sheet 0 diabled='+document.styleSheets[0].disabled+'\n sheet 1 diabled='+document.styleSheets[1].disabled+'\n sheet 2 diabled='+document.styleSheets[2].disabled+'\n sheet 3 diabled='+document.styleSheets[3].disabled+' \n sheet 4 diabled='+document.styleSheets[4].disabled);
	if (document.styleSheets[3].disabled==true) {
		document.styleSheets[3].disabled=false;
		SaveInvert(1);
		invertImages(1);
	}else{
		document.styleSheets[3].disabled=true;
		SaveInvert(0);
		invertImages(0);
	}
}

/**
 *
 * @access public
 * @return void
 **/
function invertImages(sheet){
	if (sheet==1) {
		//document.getElementById('logo').src="/interface/bccfa/logo_inverse.png";
		//document.getElementById('carf').src="/interface/bccfa/carf-logo_inverse.png";
		//document.getElementById('w3c').src="/interface/bccfa/w3c-logo_inverse.png";
		//document.getElementById('nucleuslabs').src="/interface/bccfa/nucleuslabs-logo_inverse.png";
		//document.getElementById('bccfa-small').src="/interface/bccfa/bccfa-small-logo_inverse.png";
		//document.getElementById('text_regular').src="/interface/bccfa/text_regular_inverse.png";
		//document.getElementById('text_big').src="/interface/bccfa/text_big_inverse.png";
		//document.getElementById('text_large').src="/interface/bccfa/text_large_inverse.png";
		//document.getElementById('text_invert').src="/interface/bccfa/text_invert_inverse.png";
	}else{
		//document.getElementById('logo').src="/interface/bccfa/logo.png";
		//document.getElementById('carf').src="/interface/bccfa/carf-logo.png";
		//document.getElementById('w3c').src="/interface/bccfa/w3c-logo.png";
		//document.getElementById('nucleuslabs').src="/interface/bccfa/nucleuslabs-logo.png";
		//document.getElementById('bccfa-small').src="/interface/bccfa/bccfa-small-logo.png";
		//document.getElementById('text_regular').src="/interface/bccfa/text_regular.png";
		//document.getElementById('text_big').src="/interface/bccfa/text_big.png";
		//document.getElementById('text_large').src="/interface/bccfa/text_large.png";
		//document.getElementById('text_invert').src="/interface/bccfa/text_invert.png";
	}
}

/**
 *
 * @access public
 * @return void
 **/
function disableSheets(){
	var c = document.styleSheets.length;
    for(var i=0;i<c;i++){
        document.styleSheets[i].disabled=true;
    }
}

function SaveText(cookieValue) {
 cookieName='text_size';
 nDays=7;
 var today = new Date();
 var expire = new Date();
 if (nDays==null || nDays==0) nDays=1;
 expire.setTime(today.getTime() + 3600000*24*nDays);
 document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString()+";path=/";
}

function SaveInvert(cookieValue) {
 cookieName='invert';
 nDays=7;
 var today = new Date();
 var expire = new Date();
 if (nDays==null || nDays==0) nDays=1;
 expire.setTime(today.getTime() + 3600000*24*nDays);
 document.cookie = cookieName+"="+escape(cookieValue)
                 + ";expires="+expire.toGMTString()+";path=/";
}