function chg(num){
	element1 = document.getElementById("username");
	element2 = document.getElementById("userpass2");
	element3 = document.getElementById("userpass");	
	if(num == 1){
		if(element1.value=="E-mail"){
			element1.value="";
		}
	}
	else if(num == 2){
		if(element1.value==""){
			element1.value="E-mail";
		}
	}	
	else if(num == 3){
		if(element2.value=="Password"){
			element2.style.visibility="hidden";
			element2.style.display="none";
			element3.style.visibility="visible";
			element3.style.display="block";
			element3.value="";
			element3.focus();
		}
	}
	else if(num == 4){
		if(element3.value=="" || element3.value=="Password"){
			element3.style.visibility="hidden";
			element3.style.display="none";
			element2.style.visibility="visible";
			element2.style.display="block";
			element2.value="Password";
		}
	}
}