function echeck(str) {
		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail Address")
		   return false
        }

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail Address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail Address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail Address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

 		 return true					
}

function validate(){
   if(document.form1.name.value.length < 1){
      alert("You have not entered a name. Please enter your name.");
      return false;
   }
   if(document.form1.phone.value.length < 1){
      if(document.form1.mobile.value.length < 1){
         alert("You have not entered a contact number. Please enter your phone or mobile number.");
         return false;
      }
      
   }
   if(document.form1.email.value.length < 1){
      alert("You have not entered your email address. Please enter your email address.");
      return false;
   }
   else{
   var emailID=document.form1.email;
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false;
	}
	return true;
   }


   return true;
}