function sending(){
if(document.eng.name.value==""){
alert("Please complete the field \"Name\"");return false;}
if(document.eng.email.value==""){
alert("Please complete the field \"Email\"");return false;}
if(document.eng.email.value.indexOf('@')==-1){
alert("The email address seems not to be valid");
document.eng.email.value="";return false;}
}

var nix=null;
function fii(yz){
if(nix && nix.open && !nix.closed){
window.nix.location.href=yz;window.nix.focus();
}
else{nix=window.open(yz,'','width=620,height=440,top=0,left=0');
}}

var nii=null;
function winup(yz){
if(nii && nii.open && !nii.closed){
window.nii.location.href=yz;window.nii.focus();
}
else{nii=window.open(yz,'','width=848,height=598,top=0,left=0');
}}