// JavaScript Document
function MM_openBrWindow(theURL,winName,features) { //v2.0
  window.open(theURL,winName,features);
}

times=0;
ida="";
idb="";
function check(cbox)
{
if(cbox.checked==false) 
	{
		if(times!=0) times=times-1;
        if(idb!="") idb="";
        else ida="";
     }
else {times=times+1;
      if(ida!="") idb=cbox.value;
      else ida=cbox.value;
      }
if(times==3) {alert("只能选择两种产品进行比较！");
              times=times-1;
              return (cbox.checked=false);
              }
}

function v()
{if(times<2) {alert("选择两种产品才能比较！");
              return (location=location.href);
              }
window.open('http://www.instrument.com.cn/quotation/contrast.asp?IMShowNameID1='+ida+'&IMShowNameID2='+idb,'两种产品的对比结果',"toolbar=no,menubar=no,directories=no,status=no,left=80,top=60,width=678,height=500,scrollbars=yes,resizable=yes");
}