// form input prefill clear on focus, and reset on blur (if empty)
function prefillClear(field,tagID) {
	if (field.defaultValue==field.value) {
		field.value = '';
		document.getElementById(tagID).style.color='#000000';
	}
	else if (field.value == '') {
		field.value = field.defaultValue;
		document.getElementById(tagID).style.color='#AAAAAA';
	}
	// usage example
	//<input type="text" name="input1" value="Enter your data" onfocus="prefillClear(this);" onblur="prefillClear(this);" />
}