var fDesc=new Array(); fDesc[0] = "Canute designed this simple hydraulic calculator for use with its FHC training course to teach some of the fundamental principles of pressure loss calculations and the discard of water through a sprinkler head and other type's nozzles. With this free hydraulic calculator you can easily change any variable in the Hazen Williams pressure loss equation and see what change it has made straight away. This is an invaluable free tool for teaching the basics of fire sprinkler hydraulics."; function tShowHide(id, show) { var s = document.getElementById("desc"); if ((s.innerHTML.length<=212 || show==1) && show!=2) { s.innerHTML = fDesc[id]; if (document.getElementById('m1')) document.getElementById('m1').style.display='none'; if (document.getElementById('m2')) document.getElementById('m2').style.display='none'; if (document.getElementById('more_txt')) document.getElementById('more_txt').style.display='inline'; } else { s.innerHTML = ''; } }