toggle=0;  
document.ondblclick = function(event)
{   
	if(window.event)
	{
		EventStatus = window.event.srcElement.tagName;
	}
	else
	{
		EventStatus = event.target.tagName;  
	}

	if(EventStatus!='INPUT'&&EventStatus!='TEXTAREA')
	{
		if(toggle==0)
		{
			var sc=document.body.scrollHeight - 2000; toggle=1;
		}
		else if(toggle == 1)
		{
			var sc=99999; toggle=2;
		}
		else if(toggle == 2)
		{
			var sc=0; toggle=0;
		}
		window.scrollTo(0,sc)
	}
}