function changewidth(self,p_a,p_b,p_c)
{			
    self.style.width='271';//当前
	p_a.style.width='71';
	p_b.style.width='71';
	p_c.style.width='71';
}

function renewwidth()
{			
    product01.style.width='121';
	product02.style.width='121';
	product03.style.width='121';
	product04.style.width='121';
}