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=774;
pic_height=309;
pic1=new Image(pic_width,pic_height);
pic1.src="images/header_home_01.jpg";  
pic2=new Image(pic_width,pic_height); 
pic2.src="images/header_home_02.jpg"; 
pic3=new Image(pic_width,pic_height);
pic3.src="images/header_home_03.jpg";  
pic4=new Image(pic_width,pic_height);
pic4.src="images/header_home_04.jpg";  
pic5=new Image(pic_width,pic_height);
pic5.src="images/header_home_05.jpg";  
pic6=new Image(pic_width,pic_height);
pic6.src="images/header_home_06.jpg";  
pic7=new Image(pic_width,pic_height);
pic7.src="images/header_home_23.jpg";  
pic8=new Image(pic_width,pic_height);
pic8.src="images/header_home_22.jpg";  
pic9=new Image(pic_width,pic_height);
pic9.src="images/header_home_09.jpg";  
pic10=new Image(pic_width,pic_height);
pic10.src="images/header_home_10.jpg";  
pic11=new Image(pic_width,pic_height);
pic11.src="images/header_home_11.jpg";  
pic12=new Image(pic_width,pic_height);
pic12.src="images/header_home_12.jpg";  
pic13=new Image(pic_width,pic_height);
pic13.src="images/header_home_13.jpg";  
pic14=new Image(pic_width,pic_height);
pic14.src="images/header_home_14.jpg";  
pic15=new Image(pic_width,pic_height);
pic15.src="images/header_home_15.jpg";  
pic16=new Image(pic_width,pic_height);
pic16.src="images/header_home_16.jpg";  
pic17=new Image(pic_width,pic_height);
pic17.src="images/header_home_21.jpg";  
pic18=new Image(pic_width,pic_height);
pic18.src="images/header_home_18.jpg";  
pic19=new Image(pic_width,pic_height);
pic19.src="images/header_home_19.jpg";  
pic20=new Image(pic_width,pic_height);
pic20.src="images/header_home_20.jpg";