// JavaScript Document
today=new Date(); 
jran=today.getTime(); 
function rnd() { 
ia=9301; 
ic=49297; 
im=233280; 
jran = (jran*ia+ic) % im; 
return jran/(im*1.0); 
}; 
function rand(number) { 
return Math.ceil(rnd()*number); 
}; 
document.write("<center>"); 
for(i=1;i<=1;i++) { 
myNum=(rand(19)); //改成你要随机显示的图片数； 
if(myNum == 1) document.write("<img src='images/indexrandom/10.gif' width='185' height='138'>"); //图片路径，可用http:// 
if(myNum == 2) document.write("<img src='images/indexrandom/11.gif' width='185' height='138'>");  
if(myNum == 3) document.write("<img src='images/indexrandom/12.gif' width='185' height='138'>"); 
if(myNum == 4) document.write("<img src='images/indexrandom/13.gif' width='185' height='138'>"); 
if(myNum == 5) document.write("<img src='images/indexrandom/14.gif' width='185' height='138'>"); 
if(myNum == 6) document.write("<img src='images/indexrandom/15.gif' width='185' height='138'>"); 
if(myNum == 7) document.write("<img src='images/indexrandom/16.gif' width='185' height='138'>"); 
if(myNum == 8) document.write("<img src='images/indexrandom/17.gif' width='185' height='138'>"); 
if(myNum == 9) document.write("<img src='images/indexrandom/18.gif' width='185' height='138'>"); 
if(myNum == 10) document.write("<img src='images/indexrandom/19.gif' width='185' height='138'>"); 
if(myNum == 11) document.write("<img src='images/indexrandom/20.gif' width='185' height='138'>"); 
if(myNum == 12) document.write("<img src='images/indexrandom/36.gif' width='185' height='138'>"); 
if(myNum == 13) document.write("<img src='images/indexrandom/37.gif' width='185' height='138'>"); 
if(myNum == 14) document.write("<img src='images/indexrandom/38.gif' width='185' height='138'>"); 
if(myNum == 15) document.write("<img src='images/indexrandom/39.gif' width='185' height='138'>"); 
if(myNum == 16) document.write("<img src='images/indexrandom/40.gif' width='185' height='138'>"); 
if(myNum == 17) document.write("<img src='images/indexrandom/50.jpg' width='185' height='138'>"); 
if(myNum == 18) document.write("<img src='images/indexrandom/51.jpg' width='185' height='138'>"); 
if(myNum == 19) document.write("<img src='images/indexrandom/52.jpg' width='185' height='138'>"); 


else { 
document.write(); 
} 
}; 
document.write("</center>");