// JavaScript Document
function changnav(n,m)
{	
	for(i=1;i<=m;i++)
	{	
		if(i==n) {
			var navc='nav'+i;
			eval("document.getElementById(navc).className='com'");
		}
		else
		{
			var navm='nav'+i;
			eval("document.getElementById(navm).className='zhe'");
		}
	}
}
function cancelnav(n)
{
	var can='nav'+n;
	eval("document.getElementById(can).className='zhe'");
}