$(document).ready(function() {
	var doc = document,
	inputs = doc.getElementsByTagName('input'),
	supportPlaceholder = 'placeholder' in doc.createElement('input'),
	placeholder = function(input) {
		var text = input.getAttribute('placeholder'),
		defaultValue = input.defaultValue;
		if (defaultValue == '') {
			//input.value = text
		}
		input.onfocus = function() {
			if (input.value === text) {
				this.value = ''
			}
		};
		input.onblur = function() {
			if (input.value === '') {
				this.value = text
			}
		}
		
	};
	if (!supportPlaceholder) {
		for (var i = 0,
		len = inputs.length; i < len; i++) {
			var input = inputs[i],
			text = input.getAttribute('placeholder');
			if (input.type === 'text' && text) {
				placeholder(input)
			}
		}
	}
});