function openwins(url,w,h){
	if(w>screen.width) w=screen.width-20;
	if(h>screen.height) h=screen.height-80;
	l=(screen.width-w)/2;
	t=(screen.height-h)/2;
	feat="width="+w+",height="+h+",top="+t+",left="+l+",statusbar=no,scrollbars=no,menubar=no,resizable=no";
	w1=window.open(url,'',feat);
}

function isemail(elemail){
	var p,valid,err;
	valid="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890_-.@";
	err=0;
	if(elemail!="" && elemail.length>6){
		for(i=0;i<elemail.length;i++){
			if(valid.indexOf(elemail.substring(i,i+1))==-1) err++;
		}
		if(elemail.indexOf('@')==-1) err++;
		if(elemail.indexOf('.')==-1) err++;
	}
	else{
		err++;
	}
	if(err==0) return true;
	else return false;
}