function menu_hover(i)
   {
   //alert('hovering')

   //var img = event.srcElement.src
   var img = document.getElementById(i)

   var imgsrc = img.src
   imgsrc = imgsrc.split("/")
   imgsrc = imgsrc[imgsrc.length-1]

   var imgState = imgsrc.substring(imgsrc.length-7,imgsrc.length-4)
   if (imgState == '_on')
      {
         var imgName = imgsrc.substring(4,imgsrc.length-4)
      }
   else
      {
      var imgName = imgsrc.substring(4,imgsrc.length-4)
      img.src = 'img/but_'+imgName+'_on.gif'
      }
   }

function menu_unhover(i)
   {
   //var img = event.srcElement.src
   var img = document.getElementById(i)

   var imgsrc = img.src

   imgsrc = imgsrc.split("/")
   imgsrc = imgsrc[imgsrc.length-1]

   var imgState = imgsrc.substring(imgsrc.length-7,imgsrc.length-4)
   if (imgState == '_on')
      {
         var imgName = imgsrc.substring(4,imgsrc.length-7)
         img.src = 'img/but_'+imgName+'.gif'
      }
   else
      {
      var imgName = imgsrc.substring(4,imgsrc.length-4)
      img.src = 'img/but_'+imgName+'_on.gif'
      }
   }

window.onresize = function()
               {
               //alert('resized')
               //alert(document.images.sizeX.width)
               //size_main_content()
               }

function size_main_content()
{
   document.getElementById("main_content").style.pixelWidth = document.images.sizeX.width - (document.getElementById("menu_side").style.pixelWidth+210)
}