function addAction(id, str)
{
	var ob = document.getElementById(id);
	ob.dfStr = str;
	ob.value = str;
	ob.onfocus = function(){
		this.value = this.value==this.dfStr?"":this.value;
	}
	ob.onblur = function(){
		this.value = this.value==""?this.dfStr:this.value;
	}
}