function preloadimg(){
	preloadimg = new Array();
	for(i = 0; i < preimages.length; i++){
		preloadimg[i] = new Image();
		preloadimg[i].src =  preimages[i];
	}
}


function chimg(filename,target){
	document.images[target].src = filename;
}


function openwindow(url,winname,width,height){
	sub = window.open(url,winname,'width=800,height=600,status=1,menubar=1,directories=1,location=1,toolbar=yes,resizable=1,scrollbars=1').focus();

}