function $(id)
{
	return document.getElementById(id);
}

function $n(name)
{
	return document.getElementsByName(name);
}

function getBrowser()
{
	if (window.navigator['appName'].substr(0,8)=='Netscape') 
	{
		return "Moz";
	}
	else if (window.navigator['appName'].substr(0,9)=='Microsoft') 
	{
		return "IE";
	}
	else
	{
		return "unknown";
	}
}

function trim(s) 
{
	return s.replace(/(^[ |　]*)|([ |　]*$)/g, "");
}

function setOpacity(id, myOpacity)
{
	browser = getBrowser();
	oObj = $(id);
	if (oObj)
	{
		if (browser=='IE')	{
			oObj.style.filter = "Alpha(Opacity=" + myOpacity + ")";
		} else if (browser == 'Moz'){
			omzOpacity = myOpacity/100;
			oObj.style.opacity = omzOpacity;	
		}
	}
}

//检查一组单旋钮或复选钮至少有一个被选中
function chkRadio(radioName)
{
	oRadio = $n(radioName);
	chkOK=0;
	var length = oRadio.length;	
	for(i=0;i<length;i++)
	{
		if(oRadio[i].checked)
		{
			chkOK=1;			
			break;
		}		
	}
	return chkOK;
}

//得到一组单旋钮的值
function getRadioValue(radioName)
{
	oRadio = $n(radioName);
	var length = oRadio.length;	
	for(i=0; i<length; i++)
	{
		if(oRadio[i].checked)
		{
			return oRadio[i].value;			
			break;
		}		
	}
	return false;
}