var d = document;
function Contact_FcheckForm(f){	
	if(!FcheckFilled('First name -',f.first_name.value)){ f.first_name.focus();return false; }
	if(!FcheckFilled('Last name -',f.last_name.value)){ f.last_name.focus();return false; }
	if(!FcheckEmail('E-mail -',f.email.value)){ f.email.focus(); return false; }
	if(!FcheckFilled('Phone -',f.phone.value)){ f.phone.focus();return false; }
	if(!FcheckFilled('Enquiry -',f.enquiry.value)){ f.enquiry.focus();return false; }

/**/	
	return true;
}
//------------------------------------------------------------------------

	function a_plus_b(form) {
		a=eval(form.a.value)
		b=eval(form.b.value)
		c=a+b
		form.ans.value = c
	}
	function a_minus_b(form) {
		a=eval(form.a.value)
		b=eval(form.b.value)
		c=a-b
		form.ans.value=c
	}



//------------------------------------------------------------------------
	function codenameCB(cb, t) {
		if(cb.checked)
		{
			t.disabled=false;
		} else {
			t.disabled=true;
		}
	}
	function codename(cb, t, t2) {
		if(cb.checked)
		{
			t.disabled=false;
			t2.disabled=false;
		} else {
			t.disabled=true;
			t2.disabled=true;
		}
	}
	function codename2(cb, t, t2) {
		if(cb.checked)
		{
			t.disabled=false;
			t2.disabled=true;
		} else {
			t.disabled=true;
			t2.disabled=false;
		}
	}
	
//------------------------------------------------------------------------
function FcheckRadioValue(n,v,vv,nn){
	//var r = false;
//	var i;
	//for (i = 0;  i < v.length;  i++){
	
	if (v[nn].checked) {
		if((isNaN(vv))||(vv=="")){ 
//		if(vv=="")){ 
			alert(n+" has to be numeric!");
			return false; 
		}else{ 
			return true; 
		}
		//r = true;
	} else {
		return true;
	}
	  //}  
	/*
	if (!r){ 
		alert("Select a value for "+n+" ");
		return (false); 
	} else { 
		return true; 
	}
	*/
}


function Fvalue(n,v,vv){
	if(vv.checked){ 
		if((isNaN(v))||(v=="")){ 
			alert(n+" has to be numeric!");
			return false; 
		}else{ 
			return true; 
		}
	} else { 
		return true; 
	}
}

function Fconfirm(){
	var agree=confirm("All data is filled in correct!\nSend now?");
	if (agree)
		return true ;
	else
		return false ;
}

function FcheckFilled(n,v){ 
	if(v==""){ alert(n+" is required!");return false; }
	else { return true; }
}

function FcheckMinLength(n,v,num){ 
	if(v.length<num){ alert("Min. chars for "+n+" is "+num+" ");return false; }
	else { return true; }
}

function FcheckMaxLength(n,v,num){ 
	if(v.length>num){ alert("Max. chars for "+n+" is "+num+" ");return false; }
	else { return true; }
}

function FcheckNumber(n,v){
	if((isNaN(v))||(v=="")){ 
		alert(n+" has to be numeric!");
		return false; 
	}else{ 
		return true; 
	}
}

function FcheckChars(n,v,num){ 
	if(v.length>num){ alert("Max. chars for "+n+" is "+num+"!\n"+(v.length-num)+" chars to many!");return false; }
	else { return true; }
}

function FcheckEmail(n,v){
	var a=0
	var p=0
	for(var i=1;i<v.length;i++){
		if(!v.charAt(i))return false
		else if(v.charAt(i)=='@'){a++;if(v.charAt(i+1)==''){ alert(n+" is not valid!");return false; }}
		else if(v.charAt(i)=='.'){p++;if(v.charAt(i+1)==''||v.charAt(i+1)=='@'||v.charAt(i-1)=='@'){ alert(n+" is not valid e-mail address!");return false; }}
	}
	if(a==1&&p){ return true; }
	else { 
		alert(n+" is not valid e-mail address!");
		return false; 
		//break;
	}
}

function FcheckRadio(n,v){
	var r = false;
	var i;
	for (i = 0;  i < v.length;  i++){
    if (v[i].checked)
        r = true;
  }  
	if (!r){ alert("Select a value for "+n+" ");return (false); }
	else { return true; }
}

function FcheckDropOne(n,v){
	if(v.selectedIndex<=0){ 
		alert("Select a value for "+n+" ");
		return false; 
	} else { 
		return true; 
	}
}

function FcheckDropMultiple(n,v,mi,ma){
	var sel = 0;
  var i;
  for (i = 0;  i < v.length;  i++){ if (v.options[i].selected) sel++; }
	
	if(mi>0){
		if (sel < mi) { alert("Min "+mi+" items for "+n+" ");return false; }
	}
	if(ma>0){
  	if (sel > ma) { alert("Max. "+ma+" items for "+n+" ");return false; }
	}
 	return true;
}

function FcheckBoxes(n,v,mi,ma){
  var sel = false;
	var i;
  for (i = 0;  i < v.length;  i++){ if (v[i].checked) sel++; }
	
	if(mi>0){
		if (sel < mi) { alert("Min "+mi+" items for "+n+" ");return false; }
	}
	if(ma>0){
  	if (sel > ma) { alert("Max. "+ma+" items for "+n+" ");return false; }
	}
 	return true;
}