// used to validate the form

function echeck(str) 
{

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(" ")!=-1){
		 	alert (" There is at least one 'space' in your email address - please remove it/them ");
		    return false
		 }

		if (str.indexOf(at)==-1){
		   alert (" The '@' character is not in your email address ");
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert (" The '@' character is in the wrong place in your email address ");
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
			alert (" The '.' character is missing or in the wrong place in your email address ");
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		 	alert (" Invalid email address ");
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		 	alert (" Invalid email address ");
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		 	alert (" Invalid email address ");
		    return false
		 }
		
 		 return true					
}
	
function validate_form( )
{
	var emailID=document.enquiry_form.email
	valid=true;
	
	if (document.enquiry_form.name.value =="")
	{
		alert (" Please enter name ");
		valid=false;
		
	}
	
	else if (document.enquiry_form.email.value =="" && document.enquiry_form.phone.value =="")
	{
		alert (" Please enter email address or phone number");
		valid = false;
	}
	
	else if (document.enquiry_form.comments.value =="")
	{
		alert (" Please enter 'Details' ");
		valid=false;
	}

	else if ((emailID.value!=null)&&(emailID.value!="")&&(echeck(emailID.value)==false))
	{
		valid= false;
	}
	return valid;
	
}