var speed = 5;
var currentpos=1;
var timer;

function img_zoom(e, o)		//ͼƬÊó±ê¹öÂÖËõ·Å
{
	var zoom = parseInt(o.style.zoom, 10) || 100;
	zoom += event.wheelDelta / 12;
	if (zoom > 0) o.style.zoom = zoom + '%';
		return false;
}
function setSpeed()
{
	speed = parseInt(scrollspeed.value);
	if (speed < 1 || speed > 10){
	   speed=5;
	   scrollspeed.value=5;
	}
	
}

function stopScroll()
{
    clearInterval(timer);
}

function beginScroll()
{
	timer=setInterval("scrolling()",250/speed);
}

function scrolling()
{
	//currentpos=document.documentElement.scrollTop;
	currentpos=document.body.scrollTop;
    window.scroll(0,++currentpos);
    //if(currentpos!=document.documentElement.scrollTop) clearInterval(timer);
	if(currentpos!=document.body.scrollTop) clearInterval(timer);
}

function setCookies(cookieName,cookieValue, expirehours)
{
  var today = new Date();
  var expire = new Date();
  expire.setTime(today.getTime() + 3600000 * 356 * 24);
  document.cookie = cookieName+'='+escape(cookieValue)+ ';expires='+expire.toGMTString();
}
function ReadCookies(cookieName)
{
	var theCookie=''+document.cookie;
	var ind=theCookie.indexOf(cookieName);
	if (ind==-1 || cookieName=='') return ''; 
	var ind1=theCookie.indexOf(';',ind);
	if (ind1==-1) ind1=theCookie.length;
	return unescape(theCookie.substring(ind+cookieName.length+1,ind1));
}
function saveSet()
{
	setCookies("backgroundImage",backgroundImage.options[backgroundImage.selectedIndex].value);
	//setCookies("bgcolor",bgcolor.options[bgcolor.selectedIndex].value);
	setCookies("txtcolor",txtcolor.options[txtcolor.selectedIndex].value);
	setCookies("fontsize",fontsize.options[fontsize.selectedIndex].value);
	setCookies("scrollspeed",scrollspeed.value);
}
function loadSet()
{
	var tmpstr;
	
	tmpstr = ReadCookies("backgroundImage");
	backgroundImage.selectedIndex = 0;
	if (tmpstr != "")
	{
		for (var i=0;i<backgroundImage.length;i++)
		{
			if (backgroundImage.options[i].value == tmpstr)
			{
				backgroundImage.selectedIndex = i;
				break;
			}
		}
	}
	
	/*tmpstr = ReadCookies("bgcolor");
	bgcolor.selectedIndex = 0;
	if (tmpstr != "")
	{
	    for (var i=0;i<bgcolor.length;i++)
		{
			if (bgcolor.options[i].value == tmpstr)
			{
			    
				bgcolor.selectedIndex = i;
				break;
			}
		}
	}*/
	
	tmpstr = ReadCookies("fontsize");
	fontsize.selectedIndex = 3;
	if (tmpstr != "")
	{
		for (var i=0;i<fontsize.length;i++)
		{
			if (fontsize.options[i].value == tmpstr)
			{
				fontsize.selectedIndex = i;
				break;
			}
		}
	}
	
	tmpstr = ReadCookies("txtcolor");
	txtcolor.selectedIndex = 0;
	if (tmpstr != "")
	{
		for (var i=0;i<txtcolor.length;i++)
		{
			if (txtcolor.options[i].value == tmpstr)
			{
				txtcolor.selectedIndex = i;
				break;
			}
		}
	}
	
	tmpstr = ReadCookies("scrollspeed");
	if (tmpstr=='') tmpstr=5;
	scrollspeed.value=tmpstr;
	setSpeed();
	//document.bgColor=bgcolor.options[bgcolor.selectedIndex].value;
	document.fgColor=txtcolor.options[txtcolor.selectedIndex].value;
	document.all.content.style.fontSize=fontsize.options[fontsize.selectedIndex].value;
	document.all.bbground.style.backgroundImage=backgroundImage.options[backgroundImage.selectedIndex].value;
}

document.onmousedown=stopScroll;
document.ondblclick=beginScroll;
loadSet();