pic_width=770;
pic_height=133;

if (document.images)
 {
	 pic1= new Image(pic_width,pic_height);
	 pic1.src="img/sentricon.jpg";  
	 pic2= new Image(pic_width,pic_height); 
	 pic2.src="img/trusopt.jpg";
	 pic3= new Image(pic_width,pic_height); 
	 pic3.src="img/slogan.gif"; 
	 pic4= new Image(pic_width,pic_height); 
	 pic4.src="img/barrier.jpg"; 
 }    

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;
	}
}

function get_Image()
{
	if (document.images)
	{
		var choose_one= get_random(4);  
		choose_one--;
		
		var pics= new Array(4); 
		pics[0]=pic1.src;
		pics[1]=pic2.src;
		pics[2]=pic3.src;
		pics[3]=pic4.src;
		
		document.write("<img src='"+pics[choose_one]+"' width='"+pic_width+"' height='"+pic_height+"' />");
	}
}