Easy replacing background Image with javascript

Easy replacing background Image with javascript
החלפה קלה של תמונת הרקע בדף בעזרת javascript

the simple way to change body bg image

<script>
function changeBG(pattern){
	document.getElementsByTagName('body')[0].style.backgroundImage = 'url(i/pattern_' + pattern + '.gif)'
}

<script>

but when you navigate to new page what will happen to your bg image selection ? the selection need to be save some how, well lets use Cookie

<script>
function changeBG(pattern){
	document.getElementsByTagName('body')[0].style.backgroundImage = 'url(i/pattern_' + pattern + '.gif)'
	createCookie("style", pattern, 49) // save selection
}

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 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;
}

window.onload = function(e) { // when page load, get saved selection or use default
	var style = readCookie("style");
	if(style){
		changeBG(style) get saved selection
	}else{
		changeBG('02') use default
	}
}
 
<script>

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