function fieldClass( myField ){
	this.field = myField;
	this.autoSet = private_autoSet;
}

function private_autoSet( myValue ){
	if ( this.field.value == myValue ){
		this.field.value = '';
	}
	else{
		if ( this.field.value == '' ){
			this.field.value = myValue;
		}
	}
}


/*  */

function fieldAutoSet( myField, myValue ){
	var fieldInstance;
	fieldInstance = new fieldClass( myField );
	fieldInstance.autoSet( myValue );
}