/* JavaScript/CSS Font Size Changer (c) Eyeronic Ltd, All rights are reserved http://www.eyeronic.co.uk, queries@eyeronic.co.uk Script allows increasing, decreasing and resetting of font sizes. Persisnant changes through cookies. --------------------------------------------------------------------- Directions: Change fontElementId var to the element id you wish to allow users to change font sizes. */ var fontElementId = "main_body"; //Modify to your ID eg var SizeIncrement = 10; //Change increment for more/fewer changes (font size expressed as %) function decreaseFontSize() { var element = document.getElementById(fontElementId); var size = element.style.fontSize; if (size == 0) { size = 100; } size = parseInt(size); size -= SizeIncrement; if (size <= SizeIncrement) { size = SizeIncrement; } element.style.fontSize = size + '%'; setCookie("fontSize", size, 5); } function increaseFontSize() { var element = document.getElementById(fontElementId); var size = element.style.fontSize; if (size == 0) { size = 100; } size = parseInt(size); size += SizeIncrement; element.style.fontSize = size + '%'; setCookie("fontSize", size, 5); } function resetFontSize() { var element = document.getElementById(fontElementId); size = 100; element.style.fontSize = size + '%'; setCookie("fontSize", size, 5); } function readFontSize() { var size = getCookie("fontSize") if (size) { var element = document.getElementById(fontElementId); element.style.fontSize = size + '%'; } } 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 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; }