function xx_show(){

var number=new Array();
  
  number[0]='H8RG';
  number[1]='HRMA';
  number[2]='LK5C';
  number[3]='MNY5';
  number[4]='P8Q4';
  number[5]='RDR9';
  number[6]='XDTB';
  number[7]='ZU6C';
  
	   
  
  
  		    var xx=get_random();
			document.write('<input type=hidden  name=hiddenvalue id=hiddenvalue value='+number[xx]+' />');
			document.write('<img border=0 src=image/'+number[xx]+'.gif />');
                	
}
function get_random()
{

    var xx=null;
	var yy='xzc';
	
	xx=Math.floor(Math.random()*5);
	return xx;
	
}