function checkForm() {

	 var txt=''
	 var check=0;
	 var checkMail=0;
	 var checkPhone=1;
	 var txtAl='You have to write your ';
	 var okMail = '1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM';
	 var okTel = '1234567890-';
	 var phone=document.contactUs.phone.value;
	 var email=document.contactUs.email.value;
	 document.getElementById('td_firstName').innerHTML='';
	 document.getElementById('td_lastName').innerHTML='';
	 document.getElementById('td_companyName').innerHTML='';
	 document.getElementById('td_phone').innerHTML='';
	 document.getElementById('td_email').innerHTML='';
	  if(document.contactUs.firstName.value=='')
	  {
		check=1;
		document.getElementById('td_firstName').innerHTML=txtAl+'First Name';
	  }
		if(document.contactUs.lastName.value=='')
	  {
		check=1;
		document.getElementById('td_lastName').innerHTML=txtAl+'Last Name';
	  }
	  if(document.contactUs.companyName.value=='')
	  {
		check=1;
		document.getElementById('td_companyName').innerHTML=txtAl+'Company Name';
	  }
	   if(document.contactUs.phone.value=='')
	  {
		check=1;
		document.getElementById('td_phone').innerHTML=txtAl+'Phone Number';
	  }  
	   if(document.contactUs.email.value=='')
	  {
		check=1;
		document.getElementById('td_email').innerHTML=txtAl+'Email';
	  }
	  for(i=0; i < email.length ;i++)	{
			if(okMail.indexOf(email.charAt(i))<0) { 
				checkMail=1;
			}	
		} 
	  for(j=0; j < phone.length ;j++)	{
			if(okTel.indexOf(phone.charAt(j))<0) { 
				checkPhone=0;	
			}		
		} 
		if (checkPhone==0) {
			check=1;
			document.getElementById('td_phone').innerHTML=txtAl+'Phone (digits)';
		
		}
		if(document.contactUs.email.value!='')	{
			 if ((document.contactUs.email.value.indexOf('@') == -1) || (document.contactUs.email.value.indexOf('.') == -1))
			   {
						checkMail=1;
			   }
		}
		if(checkMail==1)	{
				check=1;
				document.getElementById('td_email').innerHTML=txtAl+'Email (correct Email address)';
				}
	
	 
	  if(check==1)	{
			
			
			return false;	
		}
		
	//document.all.messStr.style.display = 'none' ;
	document.contactUs.insert.value=1;
	document.contactUs.submit();	
	}