function addLoadEvent(func) {  
var oldonload = window.onload;  
if (typeof window.onload != 'function') {  
           window.onload = func;  
} else {  
   window.onload = function() {  
       if (oldonload) {  
         oldonload();  
       }  
       func();  
      }  
  }  
} 
/* CAPTCHA image swapper */
function captchaImgRefresh() {
if(document.getElementById) {
	if(document.getElementById('refresh-captcha')) {
		document.getElementById('refresh-captcha').onclick = function() { 
			var rndm = Math.floor(Math.random()*1001); 
			document.getElementById('captcha-img').src += '&rand='+rndm;
		}
		}
	}
}
addLoadEvent(captchaImgRefresh);