input:placeholder for IE9

<!--[if IE 9]>
<script type="text/javascript">
(function setPlaceHolders(){
var input = document.getElementsByTagName('input'); // get all text fields
var cls = "placeholdr"; // set name of the class

if (input) { // if fields found
	for (var i=0; i < input.length; i++) { 
		var t = input[i]; 
		var txt = t.getAttribute("placeholder");
		
		if (txt.length > 0) { // if placeholder found
			t.className = t.value.length == 0 ? t.className+" "+cls : t.className; // add class
			t.value = t.value.length > 0 ? t.value : txt; // if no value found
			
			t.onfocus = function() { // on focus
				this.className = this.className.replace(cls);
				this.value = this.value == this.getAttribute("placeholder") ? "" : this.value;
			}
		
			t.onblur = function() { // on focus out 
				if (this.value.length == 0) {
					this.value = this.getAttribute("placeholder");
					this.className = this.className+" "+cls; // add class
				}
			}
		}  
	}
}
})();
</script>
<![endif]-->