function init(){

	document.getElementById("btCred").onmouseover = function(){document.getElementById("sub_cred").style.display = 'block';}; 
	
	document.getElementById("btCred").onmouseout = function(){document.getElementById("sub_cred").style.display = 'none';}; 
	
	document.getElementById("sub_cred").onmouseout = function(){document.getElementById("sub_cred").style.display = 'none';}; 
	
	document.getElementById("sub_cred").onmouseover = function(){document.getElementById("sub_cred").style.display = 'block';};

}
window.onload=init