function dis_chang(m,s,n,t)
{
document.getElementById(m).className=t;


document.getElementById(s).style.display="block";
document.getElementById(n).style.display="none";

}

function isIE(){
if(navigator.appName == "Microsoft Internet Explorer")
{
if(navigator.appVersion.match(/6./i)=='6.')
{ return true}
}
else{return false}
}



function correctPNG() 
{
     for(var i=0; i<document.images.length; i++)
     {
     var img = document.images[i]
     var LW=img.width
     var LH=img.height
     var imgName = img.src.toUpperCase()
     if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
     { 
           img.style.filter+="progid:DXImageTransform.Microsoft.AlphaImageLoader(src="+img.src+", sizingmethod=scale);" 
           img.src="images/transparent.gif"
           img.width=LW
           img.height=LH
		   
		   
     }
     }
}
if (isIE()) {window.attachEvent("onload", correctPNG);}