Fangirl Quietly.

var total_cost_global=0; function add_n(n) { total_cost_global=total_cost_global+n; total_cost.innerHTML = total_cost_global; } //Button's id naming scheme is: [row][place in a row] function disable_button(nid){ document.getElementById(nid).disabled = true; } function change_color1(nid1) { document.getElementById(nid1).style.color = "red"; } function change_color2(nid1,nid2) { document.getElementById(nid1).style.color = "red"; document.getElementById(nid2).style.color = "red"; } function change_color3(nid1,nid2,nid3) { document.getElementById(nid1).style.color = "red"; document.getElementById(nid2).style.color = "red"; document.getElementById(nid3).style.color = "red"; } function change_color4(nid1,nid2,nid3,nid4) { document.getElementById(nid1).style.color = "red"; document.getElementById(nid2).style.color = "red"; document.getElementById(nid3).style.color = "red"; document.getElementById(nid4).style.color = "red"; } function change_color5(nid1) { document.getElementById(nid1).style.color = "green"; } #calc_cost p { border: 3px double black; }