function valid_required(field)
{
         if(field=="")          {
         return false;
         }
    return true;
}

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

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

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

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

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

 		 return true					
	}
	
function valForm()
{
       
		if(!valid_required(document.myform.name.value) || document.myform.name.value=="Name" )
        {
			alert("Name is required field!")
			document.myform.name.focus();
			return false;
        }
		if(!echeck(document.myform.email.value) || document.myform.email.value=="Email" )
		{
			document.myform.email.focus();
			return false;
			
		}
		
		if(!valid_required(document.myform.phone.value) || document.myform.phone.value=="Phone" )
        {
			alert("Phone is required field!")
			document.myform.phone.focus();
			return false;
        }	
		
		if(!valid_required(document.myform.message.value) || document.myform.message.value=="Message" )
        {
			alert("Message is required field!")
			document.myform.message.focus();
			return false;
        }	

    return true;
}