function openwin(){
  screen_width=screen.availWidth
  screen_height=screen.availHeight
  if(screen_width<=800){
	win_width=600
	win_height=520
  }
  else{
	win_width=800
	win_height=550
  }
  win_left=(screen_width-win_width)/2
  win_top=(screen_height-win_height)/2
  window.open(arguments[0],'','height='+win_height+'px,width='+win_width+'px,top='+win_top+'px,left='+win_left+'px')
}
function search_product(){
  product_id=document.getElementById('text1').value
  if(product_id==""||product_id=='ProductID'){
    document.getElementById('text1').select()
	alert("Please input product ID")
  }
  else{
    if(arguments[0]=='_self'){
	  window.location='search.html?id='+product_id
	}
	else{
      window.open("../search/search.html?id="+product_id)
	  document.getElementById('text1').value="ProductID"
	}
  }
}