function validate()
{
   var name,location,email,phone;
   var cnt=0;
   var filter = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
   
   name=document.getElementById('name');
   phone=document.getElementById('phone');
   location=document.getElementById('location');
   
   email=document.getElementById('email');
  
    
   if(phone.value=='')
   {
        cnt=1;
		document.getElementById("error_phone").style.display = "block"; 
   }else{ 
   		document.getElementById("error_phone").style.display = "none";
   }     
   
   
   if(name.value=='')
   { 
		cnt=1;
		document.getElementById("error_name").style.display = "block"; 
   }else{ 
   		document.getElementById("error_name").style.display = "none";
   }
	      
	if(email.value!='' && !filter.test(email.value))
	{
		cnt=1;
		document.getElementById("error_Valid_email").style.display = "block"; 
	}else{ 
	    document.getElementById("error_Valid_email").style.display = "none";
    }
	
	if(email.value =='' )
	{
		cnt=1;
		document.getElementById("error_email").style.display = "block"; 
	}else{ 
	    document.getElementById("error_email").style.display = "none";
    }
	
    if(location.value=='0')
   { 
        
		cnt=1;
		document.getElementById("error_location").style.display = "block"; 
   }else{ 
   		document.getElementById("error_location").style.display = "none";
   }
   
   
   	if(cnt > 0){
		cnt=0;
		return false;		
	}else{
		return true;
	}
}
// JavaScript Document