function validate_mail(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    return false
		 }

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

 		 return true					
	}

	
	function _validate_mail(str) {
	   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0 && (str.length) > 8);
	}

	function check_form(frmObj){
		if (frmObj.first_name.value == ""){
			alert("Please enter your first name...");
			frmObj.first_name.focus();
			return false;
		} else if (frmObj.last_name.value == ""){
			alert("Please enter your last name...");
			frmObj.last_name.focus();
			return false;
		} else if (frmObj.phone.value == ""){
			alert("Please enter your phone number...");
			frmObj.phone.focus();
			return false;
		} else if (!validate_mail(frmObj.email.value)){
			alert("Please enter your e-mail address...");
			frmObj.email.focus();
			return false;
		} else if (frmObj.comments.value == ""){
			alert("Please enter the comments about this property...");
			frmObj.comments.focus();
			return false;
		} else {
			return true;
		}		
	}
	
	function check_form_static(frmObj){
		if (frmObj.name.value == ""){
			alert("Please enter your name...");
			frmObj.name.focus();
			return false;
		} else if (frmObj.phone.value == ""){
			alert("Please enter your phone number...");
			frmObj.phone.focus();
			return false;
		} else if (!validate_mail(frmObj.email.value)){
			alert("Please enter your e-mail address...");
			frmObj.email.focus();
			return false;
		} else if (frmObj.comments.value == ""){
			alert("Please enter your message...");
			frmObj.comments.focus();
			return false;
		} else {
			return true;
		}		
	}
	
	function check_contact(frmObj){
		if (frmObj.first_name.value == ""){
			alert("Please enter your first name...");
			frmObj.first_name.focus();
			return false;
		} else if (frmObj.last_name.value == ""){
			alert("Please enter your last name...");
			frmObj.last_name.focus();
			return false;
		} else if (frmObj.phone.value == ""){
			alert("Please enter your phone number...");
			frmObj.phone.focus();
			return false;
		} else if (!validate_mail(frmObj.email.value)){
			alert("Please enter your e-mail address...");
			frmObj.email.focus();
			return false;
		} else if (frmObj.comments.value == ""){
			alert("Please enter the message...");
			frmObj.comments.focus();
			return false;
		} else {
			return true;
		}		
	}
	
	function check_callback(frmObj){
		if (frmObj.name.value == ""){
			alert("Please enter your name...");
			frmObj.name.focus();
			return false;
		} else if (frmObj.phone.value == ""){
			alert("Please enter your telephone number...");
			frmObj.phone.focus();
			return false;
		} else {
			return true;
		}		
	}