//此脚本用于切换文本字号，自定义字号大小可修改text.css中fontsizer部分


var fontElementId = "doccontent";

// Module Change Font (string)
function changeFont(fontClass){
	var element = document.getElementById(fontElementId);
	element.className = fontClass;
	setCookie("fontSize", fontClass, 5);
}

// Module Set Default Font Size (void)
function setDefaultFontSize(){
	var fontSize = getCookie("fontSize")
	if(fontSize){
		var element = document.getElementById(fontElementId);
		element.className = fontSize;
	}
}

// Module Set Cookie (string, string, int)
function setCookie(c_name,value,expiredays){
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+ ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

// Module Get Cookie (string)
function getCookie(c_name){
	if(document.cookie.length>0){
		c_start=document.cookie.indexOf(c_name + "=");
		if (c_start!=-1){ 
			c_start=c_start + c_name.length+1;
			c_end=document.cookie.indexOf(";",c_start);
			if (c_end==-1) c_end=document.cookie.length;
			return unescape(document.cookie.substring(c_start,c_end));
		}
	}
	return false;
}