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 "";
}

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());
}

function checkCookie(){
  valueFontSize=getCookie('currentFontSize');
  if (valueFontSize!=null && valueFontSize!=""){
    document.getElementById("main_window").style.fontSize = valueFontSize;
  }
  else{
    valueFontSize = "1em";
    if (valueFontSize!=null && valueFontSize!=""){
    	 setCookie('currentFontSize',valueFontSize,365);
    }
  }
}

function smallText() { 
  if (document.getElementById("main_window").style.fontSize == "") {
  	 document.getElementById("main_window").style.fontSize = "1em";
  }
  if( document.getElementById("main_window").style.fontSize != "0.8em") {
   	  document.getElementById("main_window").style.fontSize = parseFloat(document.getElementById("main_window").style.fontSize) + ((-1) * 0.1) + "em";
		 setCookie('currentFontSize',document.getElementById("main_window").style.fontSize,365);
	}
}

function largeText() { 
  if (document.getElementById("main_window").style.fontSize == "") {
  	 document.getElementById("mamain_windowin").style.fontSize = "1em";
  }
  if( document.getElementById("main_window").style.fontSize != "1.4em") {
   		 document.getElementById("main_window").style.fontSize = parseFloat(document.getElementById("main_window").style.fontSize) + (1 * 0.1) + "em";
		 setCookie('currentFontSize',document.getElementById("main_window").style.fontSize,365);
  }
}