function loadScript(sScriptSrc, oCallback) {
        var oHead =  document.getElementsByTagName('head')[0];
        var oScript = document.createElement('script');
        oScript.type = 'text/javascript';
        oScript.src = sScriptSrc;
        // most browsers
        oScript.onload = oCallback;
        // ie
        oScript.onreadystatechange = function() {
                if (this.readyState == 'loaded' || this.readyState == 'complete') {
                        oCallback();
                }
        }
        oHead.appendChild(oScript);
}

function setup_number_verification(){
	$(function(){
		$("#lead_form") .submit(function(){
		        var phone = $("#phone_input").val();
			
				if(!phone){
					alert("Please enter a phone number");
	                return false;
				}
			
				phone = phone.replace(/[^\d]*/g, '');
	
		        if(phone.length >= 10){
		                return true;
		        }else{
		                alert("Please enter a phone number");
		                return false;
		        }
		});
	});	
}

if(typeof jQuery != 'function'){
	loadScript("http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js", setup_number_verification);	
}else{
		setup_number_verification();
}