function changeURLDomainByClass(classRef,domain,newdomain){	
	var allLinks = document.getElementsByTagName("a");
	if(allLinks){
		var reClassName = new RegExp("[ ]*" + classRef + "\\b");
		var reDomain = new RegExp(domain);
		for(var i=0;i<allLinks.length;i++){
			if(reClassName.test(allLinks[i].className) && reDomain.test(allLinks[i].href)){
				var strURL = allLinks[i].href;
				var strHTML = allLinks[i].innerHTML;
				allLinks[i].href = strURL.replace(reDomain,newdomain);
				allLinks[i].innerHTML = strHTML;
			}
			
		}
	}
}
changeURLDomainByClass("wvusv8","www.worldvision.org","site.worldvision.org");