function relTags()
{
	if (document.getElementsByTagName)
	{
		var anchors = document.getElementsByTagName( "a" );
		for (var loop = 0; loop < anchors.length; loop++)
		{
			var anchor = anchors[loop];
			if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external")
			{
				anchor.target = "_blank";
			}
		}
	}
}

window.onload = function()
{
	relTags();
}

function check_mail(email)
{
	var re3 = /^\s*([a-zA-Z0-9\._\-]{1,100})@([a-zA-Z0-9\.\-_]){1,100}\.([a-zA-Z]{2,4})\s*$/gi;

    if (email.value.length>=0 && !email.value.match(re3))
	{
		alert("Please enter a valid email address");
		return false;
	}

	return true;
}

function add_favorites()
{
	var detect = navigator.userAgent.toLowerCase();
	//alert(detect);

	if(detect.indexOf('opera') + 1) alert("After you close this dialog please press CTRL+T to add SEOarticles4U to Favorites");
	else if(detect.indexOf('msie') + 1) window.external.AddFavorite("http://www.SEOarticles4U.com","~SEOarticles4U.com");
	else if(detect.indexOf('firefox') + 1) alert("After you close this dialog please press CTRL+D to add SEOarticles4U to Favorites");
	else if(detect.indexOf('netscape') + 1) alert("After you close this dialog please press CTRL+D to add SEOarticles4U to Favorites");
	else alert("Please use your browser's menu to add SEOarticles4U to Favorites");
}

function counter(field, count, max)
{
	if (field.value.length > max) {
		field.value = field.value.substring(0, max);
	}
	else {
		obj = document.getElementById(count);
        obj.childNodes[0].data = max - field.value.length;
	}
}

function update_price(price)
{
	tag_len = document.form.tag.value.length;

	tag_size = document.form.tag_size.value;
	switch(tag_size)
	{
		case '12px':add_size = 0;break;
		case '15px':add_size = 2;break;
		case '20px':add_size = 4;break;
		case '25px':add_size = 8;break;
		case '30px':add_size = 16;break;
		case '35px':add_size = 32;break;
	}

	tag_color = document.form.tag_color.value;
	switch(tag_color)
	{
		case '#000000':add_color = 0;break;
		case '#FFFFFF':add_color = 0;break;
		case '#C2D220':add_color = 4;break;
		case '#D65421':add_color = 4;break;
		case '#D5B920':add_color = 4;break;
		case '#20A0CF':add_color = 6;break;
		case '#DF2278':add_color = 6;break;
	}

	tag_back = document.form.tag_back.value;
	switch(tag_back)
	{
		case '#FFFFFF':add_back = 0;break;
		case '#000000':add_back = 5;break;
		case '#C2D220':add_back = 5;break;
		case '#D65421':add_back = 5;break;
		case '#D5B920':add_back = 5;break;
		case '#20A0CF':add_back = 8;break;
		case '#DF2278':add_back = 8;break;
	}

	p = document.getElementById('total_price');
	p.childNodes[0].data = tag_len*(price + add_size+add_color+add_back);

	document.getElementById('price').value=tag_len*(price + add_size+add_color+add_back);

	//coupons
	coupon = document.getElementById('coupon').value;
	switch(coupon)
	{
		case 'ezseo':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'seomoz':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'seobook':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'brainfuel':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'stuntdubl':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'seth':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'novamatrix':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'emilychang':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'uneasysilence':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'betaflow':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'phoenixrealm':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'JohnTP':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'trep':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'sej':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'achille':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'tagspage':  p.childNodes[0].data=p.childNodes[0].data/2;break;
		case 'gadgetopia':  p.childNodes[0].data=p.childNodes[0].data/2;break;

		case 'adrian':  p.childNodes[0].data=p.childNodes[0].data*0.9;break;
		case 'vurnum':  p.childNodes[0].data=p.childNodes[0].data*0.9;break;
		case 'geoff':  p.childNodes[0].data=p.childNodes[0].data*0.9;break;
		case 'bambini':  p.childNodes[0].data=p.childNodes[0].data*0.9;break;
		case 'xmas':  p.childNodes[0].data=p.childNodes[0].data*0.9;break;
		case 'oneyear':  p.childNodes[0].data=p.childNodes[0].data*0.9;break;
		case 'alex':  p.childNodes[0].data=p.childNodes[0].data*0.9;break;
	}

	//discounts
	if(p.childNodes[0].data>=100 && p.childNodes[0].data<=199) p.childNodes[0].data = p.childNodes[0].data * 0.9;
	if(p.childNodes[0].data>=200 && p.childNodes[0].data<=299) p.childNodes[0].data = p.childNodes[0].data * 0.8;
	if(p.childNodes[0].data>=300) p.childNodes[0].data = p.childNodes[0].data * 0.7;

	p.childNodes[0].data = Math.round(p.childNodes[0].data);
	fade("total_price");
}

function update_tag_size(price)
{
	charSize = document.form.tag_size.value;
	document.getElementById('sample_tag').style.fontSize = charSize;
	update_price(price);
}

function update_tag_color(price)
{
	charColor = document.form.tag_color.value;
	document.getElementById('sample_tag').style.color = charColor;
	update_price(price);
}

function update_tag_back(price)
{
	backColor = document.form.tag_back.value;
	document.getElementById('sample_tag').style.backgroundColor = backColor;
	update_price(price);
}