// Function for loading event handled unload functions
function addLoadEvent(func) { 
	  var oldonload = window.onload; 
	  if (typeof window.onload != 'function') { 
	    window.onload = func; 
	  } else { 
	    window.onload = function() { 
	      oldonload(); 
	      func(); 
	    } 
	  } 
} 

// Function for unloading event handled unload functions
function addUnloadEvent(func) { 
	  var oldunload = window.unload; 
	  if (typeof window.unload != 'function') { 
	    window.unload = func; 
	  } else { 
	    window.unload = function() { 
	      oldunload(); 
	      func(); 
	    } 
	  } 
}