function isblank(s)
{
    for(var i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
    }
    return true;
}
function veriffy(f)
{
    var msg ="";
	var count1 = 0;
	var count2 = 0;
    for(var i = 0; i < f.length; i++)
    {
       var e = f.elements[i];
	   if(((e.name=="maison1")&& (!e.checked))||((e.name=="maison2")&& (!e.checked))){
	   	   count1+=1;
	   }
	   if((e.name=="prenom")&& isblank(e.value)){
	   		msg+="Please enter your name and surname! \n";
	   }
	   if((e.name=="telephone")&& isblank(e.value)){
	   		msg+="Please enter your telephone number ! \n";
	   }
	   if(e.name=="email"){
	   if(isblank(e.value)){
	   		msg+="Please enter your email address ! \n";
			}
			else{
				at=e.value.indexOf("@");
				dot=e.value.indexOf(".");
				lastdot=e.value.lastIndexOf(".");
				if((at<1) || (dot==-1) || (dot==at+1) || (dot==e.value.length-1) || (at==e.value.length-1) || (at>lastdot)){
					msg+="Your email address is not accurate ! \n";
				}
				}
		}
	   if((e.name=="arrivee")||(e.name=="arrivee2")||(e.name=="depart")||(e.name=="depart2")){
	   		if(e.value=="-"){
				count2+=1;
			}
		}
		
     }
	 if(count2>0){
			msg+="Please enter your arrival and departure dates ! \n";
		}
	 if(count1==2){
			msg+="Which rental home are you interested in ?  \n";
		}	
	   		
   if (msg=="") return true;
    alert(msg);
    return false;
}