var curindex=0;
function getNav(nCurrentPage,nCountPage,sPageName,sPageEXT)
{ 

var currentPage =nCurrentPage;//所在页从0开始
var prevPage = currentPage-1;//上一页
var nextPage = currentPage+1;//下一页
var countPage = nCountPage//;共多少页

//设置上一页代码
if(countPage>1&&currentPage!=0&&currentPage!=1)
	document.write("<a href=\""+sPageName.sPageEXT+"\" >首页</a>&nbsp;<a href=\""+sPageName+"_" + prevPage + "."+sPageEXT+"\" >上一页</a>&nbsp;<<");
else if(countPage>1&&currentPage!=0&&currentPage==1)
	document.write("<a href=\""+sPageName.sPageEXT+"\" >首页</a>&nbsp;<a href=\""+sPageName+"."+sPageEXT+"\" >上一页</a>&nbsp;<<");
else
	document.write("首页&nbsp;上一页&nbsp;<<");
//循环
var num = 9;
	for(var i=0+(currentPage-1-(currentPage-1)%num) ; i<=(num+(currentPage-1-(currentPage-1)%num))&&(i<countPage) ; i++){
		if(currentPage==i)
			document.write((i+1)+"</span>&nbsp;");
		else if(i==0)
			document.write("<a href=\""+sPageName+"."+sPageEXT+"\" >"+(i+1)+"</a>&nbsp;");
		else
			document.write("<a href=\""+sPageName+"_" + i + "."+sPageEXT+"\">"+(i+1)+"</a>&nbsp;");
	}


//设置下一页代码 
if(countPage>1&&currentPage!=(countPage-1))
	document.write(">>&nbsp<a href=\""+sPageName+"_" + nextPage + "."+sPageEXT+"\" >下一页</a>&nbsp;<a href=\""+sPageName+"_"+ (countPage-1) + "."+sPageEXT+"\" >尾页</a>&nbsp;");
else
	document.write(">>&nbsp下一页&nbsp;尾页&nbsp;");
	
 //设置下拉列表
           curindex=currentPage;
            document.write("&nbsp跳转到：<select id=\"sld\" name=\"select\" style=\"width:54px; height:18px; border:#D2BC83 1px solid\"  onchange=\"javascript:topage()\">" );
            for(var i=1;i<=countPage;i++){
             if(nCurrentPage==i-1)
            document.write("<option value=\""+i+"\" selected>"+i+"</option>");
          else
            document.write("<option value=\""+i+"\">"+i+"</option>");
}
            document.write("</select >");
}
function topage(){
	var n=curindex;
	var url ="";
     var num=document.getElementById("sld").value;
       var str = (num-1)+"."+"htm";
	  if(n>0)
	    url = location.href.substring(0,location.href.lastIndexOf("_"));
	  else{
           if(location.href.lastIndexOf(".htm")>0)
	     url = location.href.substring(0,location.href.lastIndexOf("."));
           else
            url = location.href+"index";
          }
	if(num==1)
		
		location.href = url+"."+"htm";
	else
		location.href = url+"_"+str;
   }