function fontChange(str){
        var targetFile;
		
       
	   
	   if(str=="small"){
	   	targetFile="css/font_small.css";
		  
	   }
	   
	   else if(str=="default"){
	   	targetFile="css/font_default.css";
		    
	   }
	   
	   else if(str=="big"){
	   	targetFile="css/font_big.css";
		    
	   }
	   
		
		
		
        document.cookie="fontstyle="+targetFile+";path=/;";
		
		
        window.location.reload();

}

var url="/";
var name="fontstyle";
var cookie=document.cookie;

if(-1==cookie.indexOf(name)){
        var file='css/font_default.css';
}else{
        var pos_s=cookie.indexOf(name)+name.length+1;
        var pos_e=cookie.indexOf(";",pos_s);
        if(-1==pos_e){
                var file=cookie.slice(pos_s);
        }else{
                var file=cookie.slice(pos_s,pos_e);
        }
}


document.write('<link href="'+url+''+file+'" rel="stylesheet"  type="text/css" media="all"/>');