function checkform(of)
		{
		// Test if DOM is available and there is an element called required
			if(!document.getElementById || !document.createTextNode){return;}
			if(!document.getElementById('required')){return;}

		// Define error messages and split the required fields
			var errorID='errormsg';
			var errorClass='form_error'
			var errorMsg='Please make sure that you have filled in the highlighted fields above, and that you have entered a valid email address. Thanks!';
			var errorImg='i/warn.png';
			var errorAlt='Error';
			var errorTitle='This field has an error!';
			var reqfields=document.getElementById('required').value.split(',');

		// Cleanup old mess
			// if there is an old errormessage field, delete it
			if(document.getElementById(errorID))
			{
				var em=document.getElementById(errorID);
				em.parentNode.removeChild(em);
			}
			// remove old images and classes from the required fields
			for(var i=0;i<reqfields.length;i++)
			{
				var f=document.getElementById(reqfields[i]);
				if(!f){continue;}
				if(f.previousSibling && /img/i.test(f.previousSibling.nodeName))
				{
					f.parentNode.removeChild(f.previousSibling);
				}
				f.className='';
			}
		// loop over required fields
			for(var i=0;i<reqfields.length;i++)
			{
		// check if required field is there
				var f=document.getElementById(reqfields[i]);
				if(!f){continue;}
		// test if the required field has an error, 
		// according to its type
				switch(f.type.toLowerCase())
				{
					case 'text':
						if(f.value=='' && f.id!='email'){cf_adderr(f)}							
		// email is a special field and needs checking
						if(f.id=='email' && !cf_isEmailAddr(f.value)){cf_adderr(f)}							
					break;
					case 'textarea':
						if(f.value==''){cf_adderr(f)}							
					break;
					case 'checkbox':
						if(!f.checked){cf_adderr(f)}							
					break;
					case 'select-one':
						if(!f.selectedIndex && f.selectedIndex==0){cf_adderr(f)}							
					break;
				}
			}
			return !document.getElementById(errorID);

			/* Tool methods */
			function cf_adderr(o)
			{
				// create image, add to and colourise the error fields
				var errorIndicator=document.createElement('img');
				errorIndicator.alt=errorAlt;
				errorIndicator.src=errorImg;
				errorIndicator.title=errorTitle;
				o.className=errorClass;
// 				o.parentNode.insertBefore(errorIndicator,o);

			// Check if there is no error message
				if(!document.getElementById(errorID))
				{
				// create errormessage and insert before submit button
					var em=document.createElement('div');
					em.id=errorID;
					var newp=document.createElement('p');
					newp.appendChild(document.createTextNode(errorMsg))
					// clone and insert the error image
					newp.appendChild(errorIndicator.cloneNode(true));
					em.appendChild(newp);
					// find the submit button 
					for(var i=0;i<of.getElementsByTagName('input').length;i++)
					{
						if(/submit/i.test(of.getElementsByTagName('input')[i].type))
						{
							var sb=of.getElementsByTagName('input')[i];
							break;
						}
					}
					if(sb)
					{
						sb.parentNode.insertBefore(em,sb);
					}	
				} 
			}
			function cf_isEmailAddr(str) 
			{
			    return str.match(/^[\w-]+(\.[\w-]+)*@([\w-]+\.)+[a-zA-Z]{2,7}$/);
			}
		}



// Use this function to retrieve a cookie.
function getCookie(name){
var cname = name + "=";               
var dc = document.cookie;             
    if (dc.length > 0) {              
    begin = dc.indexOf(cname);       
        if (begin != -1) {           
        begin += cname.length;       
        end = dc.indexOf(";", begin);
            if (end == -1) end = dc.length;
            return unescape(dc.substring(begin, end));
        } 
    }
return null;
}

// Use this function to save a cookie.
function setCookie(name, value, expires) {
document.cookie = name + "=" + escape(value) + "; path=/" +
((expires == null) ? "" : "; expires=" + expires.toGMTString());
}

// Use this function to delete a cookie.
function delCookie(name) {
document.cookie = name + "=; expires=Thu, 01-Jan-70 00:00:01 GMT" +  "; path=/";
}



// Function to retrieve form element's value.
function getValue(element) {
var value = getCookie(element.name);
    if (value != null) element.value = value;
}

// Function to save form element's value.
function setValue(element) {
setCookie(element.name, element.value, exp);
}

var exp = new Date();                                   
exp.setTime(exp.getTime() + (1000 * 60 * 60 * 24 * 31));

window.onload = function() {
	var f = document.getElementById("checkout");
    if (f) {

            first_name = getCookie("first_name");
            f.first_name.value = first_name;

            last_name = getCookie("last_name");
            f.last_name.value = last_name;

            address1 = getCookie("address1");
            f.address1.value = address1;

            address2 = getCookie("address2");
            f.address2.value = address2;

            city = getCookie("city");
            f.city.value = city;

            zip = getCookie("zip");
            f.zip.value = zip;

            email = getCookie("email");
            f.email.value = email;

            phone = getCookie("phone");
            f.phone.value = phone;

        }
    }