function placeHolder(obj) {
	if (!obj.getAttribute('placeholder')) return;

	var supportPlaceholder = 'placeholder' in document.createElement('input');
	if (!supportPlaceholder) {
		var defaultValue = obj.getAttribute('placeholder');
		var placeHolderCont = document.createTextNode(defaultValue);
		var oWrapper = document.createElement('span');

		/*oWrapper.className = 'wrap-placeholder';*/
		oWrapper.style.cssText = 'position:absolute; background-color:rgba(0, 0, 0, 0);';

		oWrapper.style.color = getStyle(obj, 'color');
		oWrapper.style.textAlign = getStyle(obj, 'textAlign');
		oWrapper.style.verticalAlign = getStyle(obj, 'verticalAlign');
		oWrapper.style.fontFamily = getStyle(obj, 'fontFamily');
		oWrapper.style.fontSize = getStyle(obj, 'fontSize');

		oWrapper.style.top = getStyle(obj, 'top');
		oWrapper.style.left = getStyle(obj, 'left');
		oWrapper.style.right = getStyle(obj, 'right');
		oWrapper.style.paddingTop = getStyle(obj, 'paddingTop');
		oWrapper.style.paddingLeft = getStyle(obj, 'paddingLeft');
		oWrapper.style.paddingRight = getStyle(obj, 'paddingRight');

		oWrapper.style.width = obj.offsetWidth;
		oWrapper.style.height = (obj.nodeName.toLowerCase()=='textarea')? '' : obj.offsetHeight + 'px';
		oWrapper.style.lineHeight = parseInt(oWrapper.style.height) - (parseInt(oWrapper.style.paddingTop)? 4:0) + 'px';

		oWrapper.style.marginTop = getStyle(obj, 'marginTop')? getStyle(obj, 'marginTop') : '1px';
		oWrapper.style.marginLeft =  -obj.offsetWidth + 'px';

		oWrapper.appendChild(placeHolderCont);
		obj.parentNode.insertBefore(oWrapper, obj.nextSibling);

		oWrapper.onclick = function () {
			obj.focus();
		}

		if (typeof(obj.oninput)=='object') {
		    obj.addEventListener("input", changeHandler, false);
		} else {
		    obj.onpropertychange = changeHandler;
		}

		function changeHandler() {
			oWrapper.style.display = (obj.value != '' ? 'none' : 'inline-block');
		}

	}
}


function getStyle(obj, styleName) {
	var oStyle = null;
	if (obj.currentStyle) {
		oStyle = obj.currentStyle[styleName];
	} else if (window.getComputedStyle) {
		oStyle = window.getComputedStyle(obj, null)[styleName];
	}

	return oStyle;
}