//两个按钮的切换
function Tab(a,b,c,d)
{
    var div1 = document.getElementById(a);
	var div2 = document.getElementById(b);
	var div1_c = document.getElementById(a+'_c');
	var div2_c = document.getElementById(b+'_c');
	if (div1&&div2)
	{
	    div1_c.className = c;
		div1.style.display = '';

		div2_c.className = d;
		div2.style.display = 'none';
	}
}

//多按钮切换
function Show(di,num,divn,activecss,unactivecss)
		{
		   var obj = document.getElementById(divn+di);
		   obj.className = activecss;
		   var divobj = document.getElementById(divn+di+'_nr');
		   divobj.style.display = 'block';
		   
			   for(i=0;i<num;i++)
			   {
			     if(di!=i)
				   {
				     temobj = document.getElementById(divn+i);
					 temobj.className = unactivecss;
					 divobj = document.getElementById(divn+i+'_nr');
					 divobj.style.display = 'none';
				    }
				}
		     }
//定义ID函数
function $(s)
{
  return document.getElementById(s);
}