var scr={
	
	t:0,
	cs:0,
	h:new Array('0'),
	e:new Array('','#image','#about','#services','#contact'),
	m:new Array('Welcome to Kalcrest Site Services','About Kalcrest Site Services','Kalcrest Services and Downloads','Contact Kalcrest Site Services'),
	
	ini:function(){
	
		for(i=1;i<=4;i++){
			this.t+=$(this.e[i]).height();
			this.h[i]=this.t-39;
		}
	
	},
	
	goto:function(id){
		
		if(this.t==0) this.ini();
		$('html,body').animate({scrollTop:this.h[id]},'slow');
	},
	
	scrll:function(){
		
		if(this.t==0) this.ini();
		
		this.cs=$(window).scrollTop();
		
		if(this.cs>=this.h[3]) this.addcls(3);
		else if(this.cs>=this.h[2]) this.addcls(2);
		else if(this.cs>=this.h[1]) this.addcls(1);
		else this.addcls(0);
	
	},
	
	addcls:function(id){
		
		$('nav').find('li').removeClass('on');
		$('nav').find('a').removeClass('on');
		$('#li'+id).addClass('on');
		$('#li'+id).find('a').addClass('on');
		
		$('title').text(this.m[id]);
		
		
	}
	
}