function get_cookie_name(Name,page)
{
	var search = Name+"=";
    //document.write(search);
	var returnvalue = "";
	if (document.cookie.length > 0)
    {
		offset = document.cookie.indexOf(search);
        //document.write(offset);
        if (offset != -1)
        {
        	// if cookie exists
			offset += search.length;
			// set index of beginning of value
            end = offset+parseInt(page)-1;
			// set index of end of cookie value
			if (end == -1)
			{
				end = document.cookie.length;
			}
			returnvalue=unescape(document.cookie.substring(offset, end))
		}
	}
	return returnvalue;
}
function get_cookie_page(Name)
{
	var search = Name+"=";
    //document.write(search);
	var returnvalue = "";
	if (document.cookie.length > 0)
    {
		offset = document.cookie.indexOf(search);
        //document.write(offset);
        if (offset != -1)
        {
        	// if cookie exists
			offset += search.length;
			// set index of beginning of value
			end = document.cookie.indexOf(";", offset);
			// set index of end of cookie value
			if (end == -1)
			{
				end = document.cookie.length;
			}
			returnvalue=unescape(document.cookie.substring(offset, end))
		}
	}
	return returnvalue;
}
function chang_score()
{
	var oForm=document.question;
	var length = oForm.elements.length;
    var j=0;
    var page = get_cookie_page("page");
    page++;
    //alert(page);
    if (page<oForm.page.value)
    {
    	alert("您还没有答完前面的题目");
    }
    else
    {
   		for (var i=0; i<length; i++)
   		{
   			obj = oForm.elements[i];
    	    if(obj.checked)
    	    {
    	       j++;
     	       page=oForm.page.value;
               //alert(page);
     	       var score = get_cookie_name("score",page)
	 	       score=score+obj.value;
     	       document.cookie="score="+score;
     	       document.cookie="page="+page;
     	       var next=parseInt(oForm.page.value)+1;
     	       //alert(next);
     	       var next=next+".html";
      	       window.location=next;
            }
   		}
    	if(j==0)
    	{
       		alert("您还没有答题");
       	    return false;
    	}
	}
}