function isEmpty(a){return((a==null)||(a.length==0))}function card_type(a){var g=false;var a=a.toString();var b=a.substring(0,1);var d=a.substring(0,3);if(b==4){g="Visa"}var e=a.substring(0,2);if(e>50&&e<56){g="Master Card"}if(e==34||e==37){g="AMEX"}var c=a.substring(0,4);if(c==6011){g="Discover"}return g}function mod10(d){var c=0;var a=0;for(var b=(d.length-1);b>=0;b--){if(a==1){if(d.charAt(b)>="0"&&d.charAt(b)<="9"){var e=d.charAt(b)*2;if(e>9){e-=9}c+=e;a=0}}else{if(d.charAt(b)>="0"&&d.charAt(b)<="9"){c=c+parseInt(d.charAt(b));a=1}}}if((c%10)==0){return true}else{return false}}function fcur(c){var b=false;c=c.toString().replace(/\$|\,/g,"");if(isNaN(c)){c="0"}if(c<0){c=Math.abs(c);b=true}cents=Math.floor((c*100+0.5)%100);c=Math.floor((c*100+0.5)/100).toString();if(cents<10){cents="0"+cents}for(i=0;i<Math.floor((c.length-(1+i))/3);i++){c=c.substring(0,c.length-(4*i+3))+","+c.substring(c.length-(4*i+3))}var a=c+"."+cents;if(b){a="-"+a}return a}function isDef(o){varToStr=eval("' "+o+"'");if(varToStr==" undefined"){return false}else{return true}}function calc(a){cs=document.forms.cart.elements.ship.length;for(i=0;i<cs;i++){shi=document.forms.cart.elements.ship[i];shp=document.forms.cart.elements["ship_hidden_"+shi.value];if(shi.checked){sh_price=parseFloat(shp.value)}}st=parseFloat(document.getElementById("subtotal").innerHTML);st+=sh_price;t=document.getElementById("total");obj=document.getElementById("shipping_price");obj.innerHTML="$"+fcur(sh_price);if(isDef(t)){t.innerHTML=fcur(st)}}function showElement(a){document.getElementById(a).style.display="inline"}function hideElement(a){document.getElementById(a).style.display="none"}var agt=navigator.userAgent.toLowerCase();var is_major=parseInt(navigator.appVersion);var is_minor=parseFloat(navigator.appVersion);var is_nav=((agt.indexOf("mozilla")!=-1)&&(agt.indexOf("spoofer")==-1)&&(agt.indexOf("compatible")==-1)&&(agt.indexOf("opera")==-1)&&(agt.indexOf("webtv")==-1)&&(agt.indexOf("hotjava")==-1));var 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