var minfs=8;
var maxfs=24;
var defsize=12;
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 var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function showCookie(name) {
	var xcook = readCookie(name);
	alert(xcook);
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}

function setFontSize() {
   var p = document.getElementsByTagName('p');
   var td = document.getElementsByTagName('td');
      if(readCookie("fontsize") != undefined) {
         var s = parseInt(readCookie("fontsize"));
      } else {
         var s = defsize;
      }  
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = s+"px";

   }
   for(i=0;i<td.length;i++) {
      td[i].style.fontSize = s+"px";

   }    
}

function incFontSize() {
   var p = document.getElementsByTagName('p');
   var td = document.getElementsByTagName('td');
      if(readCookie("fontsize") != null) {
         var s = parseInt(readCookie("fontsize"));
      } else {
         var s = defsize;
      }
      if(s!=maxfs) {
         s += 2;
      }   
	  createCookie("fontsize",s,28);
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = s+"px";

   }
   for(i=0;i<td.length;i++) {
      td[i].style.fontSize = s+"px";

   } 	  
}

function decFontSize() {
   var p = document.getElementsByTagName('p');
   var td = document.getElementsByTagName('td');
      if(readCookie("fontsize") != undefined) {
         var s = parseInt(readCookie("fontsize"));
      } else {
         var s = defsize;
      }
      if(s!=minfs) {
         s -= 2;
      }   
	  createCookie("fontsize",s,28);
   for(i=0;i<p.length;i++) {
      p[i].style.fontSize = s+"px";

   }
   for(i=0;i<td.length;i++) {
      td[i].style.fontSize = s+"px";

   }	  
}