var img1 = "http://public.hcsc.net/hrjob/images/header/headmid_1.jpg"
var img2 = "http://public.hcsc.net/hrjob/images/header/headmid_2.jpg"
var img3 = "http://public.hcsc.net/hrjob/images/header/headmid_3.jpg"
var img4 = "http://public.hcsc.net/hrjob/images/header/headmid_4.jpg"
var img5 = "http://public.hcsc.net/hrjob/images/header/headmid_5.jpg"
var img6 = "http://public.hcsc.net/hrjob/images/header/headmid_6.jpg"

var randomize = Math.round(Math.random()*5) 

if (randomize == 1){ 
newimg = img1 
}else if (randomize == 2){ 
newimg = img2 
}else if (randomize == 3){ 
newimg = img3
}else if (randomize == 4){ 
newimg = img4
}else if (randomize == 5){ 
newimg = img5
}else {
newimg = img6
}
document.write('<IMG SRC="'+newimg+'">')