function fnFocus(e) {
	if (this.value == 'Enter Email Address') {
		this.value = '';
	}
} 
function fnBlur(e) {
	if (this.value == '') {
		this.value = 'Enter Email Address';
	}
}

function fnLoad() {
	var elements = YAHOO.util.Dom.getElementsByClassName('signup-input-field', 'input'); 
	
	for (var num = 0;num <= elements.length; num++) {
		YAHOO.util.Event.addListener(elements[num], "focus", fnFocus); 
		YAHOO.util.Event.addListener(elements[num], "blur", fnBlur); 
	}
}
YAHOO.util.Event.onDOMReady(fnLoad);