function get_random(maxNum) {
	if (Math.random && Math.round) {
		var ranNum= Math.round(Math.random()*(maxNum-1));
		ranNum+=1;
		return ranNum;
	} else {
		today= new Date();
		hours= today.getHours();
		mins=   today.getMinutes();
		secn=  today.getSeconds();
		if (hours==19)
			hours=18;
		var ranNum= (((hours+1)*(mins+1)*secn)%maxNum)+1;
		return ranNum;
	}
}

pic_width=474;
pic_height=168;
pic1=new Image(pic_width,pic_height);
pic1.src="images/img_home_01.jpg";  
pic2=new Image(pic_width,pic_height); 
pic2.src="images/img_home_02.jpg"; 
pic3=new Image(pic_width,pic_height);
pic3.src="images/img_home_03.jpg";  
pic4=new Image(pic_width,pic_height);
pic4.src="images/img_home_04.jpg";  
pic5=new Image(pic_width,pic_height);
pic5.src="images/img_home_05.jpg";  
pic6=new Image(pic_width,pic_height);
pic6.src="images/img_home_06.jpg";