var myObj;

function setFormName(text_obj){
  myObj = text_obj;
}

function write_moji(val) {
	var emoji = val;
	if (myObj == null) return;
	if(navigator.appName.indexOf("Microsoft") > -1){ // IE�̏ꍇ
		myObj.focus();
		if (!document.selection) return;
		var range = document.selection.createRange();
		range.text=emoji;
		myObj.focus();
	}else{
		if (field.createTextRange && field.caretPos) {
			var caretPos = field.caretPos;
			caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? emoji + ' ' : emoji;
			myObj.focus();
		} else {
			myObj.value  += emoji;
			myObj.focus();
		}
	}
}