function imageswap(newmain,caption) 
{ 	
	document.images["mainimg"].src=newmain;
	document.images["mainimg"].alt=caption;		
} 
  
function imagepop(id) 
{ 	
	popsrc = document.images["mainimg"].src;
	popsrc = popsrc.toLowerCase();
	pos = popsrc.indexOf("siteimages");
	imagename=popsrc.substring(pos +  11,popsrc.length)
	popcaption = document.images["mainimg"].alt;
	poptarget = "showimage.asp?popid=" + id + "&ImageName=" + imagename + "&ImageCaption=" + popcaption;
	MM_openBrWindow(poptarget,'Popup','toolbar=no,location=no,scrollbars=yes,width=800,height=600');	
}