var currentFontSize = 1;

function revertStyles(fontsize){
	currentFontSize = fontsize;
	changeFontSize(0);
}

function changeFontSize(sizeDifference){
	//get css font size
	var rule = getRuleByName("fs" + (currentFontSize + sizeDifference));
	if (rule){
		element = document.getElementById("content");
		element.style.fontSize = rule.style.fontSize;
		currentFontSize = currentFontSize + sizeDifference;
		createCookie("FontSize", currentFontSize, 365);
	}
	return;
	
};

function getRuleByName(ruleName){
		var style = document.styleSheets[0];
		var rules = style.cssRules?style.cssRules:style.rules;
		if (rules){
			for (j = 0; j<rules.length; j++){
				if (rules[j].selectorText.toUpperCase() == ruleName.toUpperCase()){
					return rules[j];
				}
			}
		}
	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=/";
}