// JavaScript Document


function SmoothScroll(targetID){
	if( !document.getElementById ) {return true;}
	var step=10;	//初速度
	var max=200;	//最高速度
	var accel=4;	//加速度
	var interval=30;	//加速インターバル
	var current_y = document.body.scrollTop;
	var element=document.getElementById(targetID);
	if (!element){return true;}
	var target_y = 0;
	for (i = element;i.offsetParent;i=i.offsetParent ){
		target_y += i.offsetTop;
	}
	var count=0;
	if ( current_y > target_y ){ step = -(step); accel = -(accel);}
	var timerid = setInterval(function(){
		if (step<max) step += (count*accel);
		if ( Math.abs(current_y-target_y) < Math.abs(step) ){
			window.scrollTo(document.body.scrollLeft,target_y);
			clearInterval(timerid);
			return false;
		}else{
			window.scrollBy(0,step);
			current_y += step;
			count++;
		}
	},interval);
	return false;
}



function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}