function changeTab(index,num){for(var i=1;i<=num;i++){document.getElementById("li_"+i).className="normal";document.getElementById("li_"+index).className="selected";document.getElementById("div"+i).style.display="none"}document.getElementById("div"+index).style.display="block"}function CheckForm(){if(document.orderonline.product.value==""){alert("Product name is required.");document.orderonline.product.focus();return false}if(document.orderonline.name.value==""){alert("Name is required.");document.orderonline.name.focus();return false}if(document.orderonline.tel.value==""){alert("Telephone is required.");document.orderonline.tel.focus();return false}else if(document.orderonline.email.value==""){alert("Email is required");document.orderonline.email.focus();return false}else{if(isEmail(document.orderonline.email)==false){alert("Invalid E-Mail address.\nPlease enter a valid E-Mail address\n(eg:username@unisbm.com)\n");document.orderonline.email.focus();return false}}document.getElementById('orderonline').submit()}function isEmail(field){if((field.value.indexOf('@',0)==-1)||field.value.indexOf('.')==-1){return false}else{return true}}