window.onload = function(){
		myMonth=(new Date()).getMonth() + 1;
		var strNewImg;
		var strNewCss;
		switch(myMonth){
		case 3:
		case 4:
		case 5:
			strNewImg = "url(./images/bg_html_home_3-5.png)";
			break;
		case 6:
		case 7:
		case 8:
			strNewImg = "url(./images/bg_html_home_6-8.png)";
			break;
		case 9:
		case 10:
		case 11:
			strNewImg = "url(./images/bg_html_home_9-11.png)";
			break;
		case 12:
		case 1:
		case 2:
			strNewImg = "url(./images/bg_html_home_12-2.png)";
			break;
		}
		document.body.style.backgroundImage  = strNewImg;
	}