/**
 * change class by given id and class name
 * 
 * @param id
 * @param class_name
 * @return
 */
function changeClass(id, class_name) {
	document.getElementById(id).className = class_name;
}
/**
 * javascript get cookie name
 * @param c_name
 * @return
 */
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;
}
/**
 * change the image soruce by give id and source 
 * 
 * @param id
 * @param source
 * @return
 */
function changeImageSrc(id,source) {
	document.getElementById(id).src = source;
}
/**
 * change the link soruce by give id and source 
 * 
 * @param id
 * @param source
 * @return
 */
function changeLinkSrc(id,source) {
	document.getElementById(id).href = source;
}