if( document.images ) {
	but1 = new Image(49,48) ;
	but1.src = "images/thumb_b3.gif";
	but2 = new Image(49,48) ;
	but2.src = "images/thumb_b3_over.gif";     
	but3 = new Image(49,48) ;
	but3.src = "images/thumb_b4.gif";
	but4 = new Image(49,48) ;
	but4.src = "images/thumb_b4_over.gif";   
	but5 = new Image(49,48) ;
	but5.src = "images/thumb_b5.gif";
	but6 = new Image(49,48) ;
	but6.src = "images/thumb_b5_over.gif";     
	but7 = new Image(49,48) ;
	but7.src = "images/thumb_b6.gif";
	but8 = new Image(49,48) ;
	but8.src = "images/thumb_b6_over.gif";  
	but9 = new Image(49,48) ;
	but9.src = "images/thumb_b7.gif";
	but10 = new Image(49,48) ;
	but10.src = "images/thumb_b7_over.gif";     
	but11 = new Image(49,48) ;
	but11.src = "images/thumb_b8.gif";
	but12 = new Image(49,48) ;
	but12.src = "images/thumb_b8_over.gif";  
}

function chkVer(imagename,objectsrc) {
	var n=navigator.appName
	var v=parseInt(navigator.appVersion)
	var browsok=((n=="Netscape")&&(v>=3))
	var browsok2=((n=="Microsoft Internet Explorer")&&(v>=4))
	
	if ((browsok)||(browsok2))
		document.images[imagename].src=eval(objectsrc+".src")
}