var global = 5;
addEvent(window,"load",init);
addEvent(window,"load",getSingleVideoDetails);

function init(){
 global=5+100;
}

function getSingleVideoDetails(){
alert(global);//returns 5
}


function addEvent(obj, evType, fn){ 
 if (obj.addEventListener){ 
   obj.addEventListener(evType, fn, false); 
   return true; 
 } else if (obj.attachEvent){ 
   var r = obj.attachEvent("on"+evType, fn); 
   return r; 
 } else { 
   return false; 
 } 
}