function checkM()
{
	with (window.document.frmcontact) 
	{
				if (isEmpty(zaglavie, 'Въведете име!'))
				{
					return false;
				}
				
				else if (isEmpty(tel, 'Въведете телефон!'))
				{
					return false;
				}
				else if(isPhone(tel, 'Въведете валиден телефон!')==false)
				{
					return false;
				}
				else if (isEmpty(email, 'Въведете email!'))
				{
					return false;
				}
				else if(validateEmailv2(email.value)==false) 
				{ 
				    strError = "Въведете валиден e-mail! ";               
					alert(strError); 
					return false;
				}
				else if (isEmpty(saobshtenie, 'Въведете запитване!')) 
				{
					return false;
				}					
					
		}//with
}
function checkM1()
{
	with (window.document.frmcontact) 
	{
				if (isEmpty(zaglavie, 'Enter name!'))
				{
					return false;
				}
				
				else if (isEmpty(tel, 'Enter phone!'))
				{
					return false;
				}
				else if(isPhone(tel, 'Enter valid phone number!')==false)
				{
					return false;
				}
				else if (isEmpty(email, 'Enter email!'))
				{
					return false;
				}
				else if(validateEmailv2(email.value)==false) 
				{ 
				    strError = "Enter valid e-mail! ";               
					alert(strError); 
					return false;
				}
				else if (isEmpty(saobshtenie, 'Enter enquiry!')) 
				{
					return false;
				}					
					
		}//with
}
function Checkanketa(chk)
{
	if( chk[0].checked==false && chk[1].checked==false && chk[2].checked==false && chk[3].checked==false)
	{ alert("Изберете опция!"); 
	return false;
	}
}
function isAlphabet(elem, helperMsg){
	var alphaExp = /^[a-zA-Z]+$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}
function isEmpty(elem, helperMsg){
	if(elem.value.length == 0){
		alert(helperMsg);
		elem.focus(); // set the focus to this input
		return true;
	}
	return false;
}

function isPhone(elem, helperMsg)
{
	//var alphaExp = /^[a-zA-Z]+$/;
	var alphaExp = /^[ 1234567890\/()+]+$/;
	if(elem.value.match(alphaExp)  && elem.value.length >="4" && elem.value.length <="20" )
	{
		return true;
	}else
	{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}


function validateEmailv2(email)
{
// a very simple email validation checking. 
// you can add more complex email checking if it helps 
    if(email.length <= 0)
	{
	  return true;
	}
    var splitted = email.match("^(.+)@(.+)$");
    if(splitted == null) return false;
    if(splitted[1] != null )
    {
      var regexp_user=/^\"?[\w-_\.]*\"?$/;
      if(splitted[1].match(regexp_user) == null) return false;
    }
    if(splitted[2] != null)
    {
      var regexp_domain=/^[\w-\.]*\.[A-Za-z]{2,4}$/;
      if(splitted[2].match(regexp_domain) == null) 
      {
	    var regexp_ip =/^\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\]$/;
	    if(splitted[2].match(regexp_ip) == null) return false;
      }// if
      return true;
    }
return false;
}